diff --git a/DEPS b/DEPS
index eb10a209ca5f..db8ae433db54 100644
--- a/DEPS
+++ b/DEPS
@@ -3,7 +3,7 @@ use_relative_paths = True
 deps = {
   "vendor/ad-block": "https://github.com/brave/ad-block.git@11ab48c4b2bd5355e789d4c87005ab2c14eecc09",
   "vendor/autoplay-whitelist": "https://github.com/brave/autoplay-whitelist.git@a85d71af4e416cf8188dc297320b0d777aafa315",
-  "vendor/extension-whitelist": "https://github.com/brave/extension-whitelist.git@463e5e4e06e0ca84927176e8c72f6076ae9b6829",
+  "vendor/extension-whitelist": "https://github.com/brave/extension-whitelist.git@a3a9a768900909739db99d79541fc56c2984407d",
   "vendor/tracking-protection": "https://github.com/brave/tracking-protection.git@29b1f86b11a8c7438fd7d57b446a77a84946712a",
   "vendor/hashset-cpp": "https://github.com/brave/hashset-cpp.git@4b55fe39bb25bb0d8b11a43d547d75f00c6c46fb",
   "vendor/bloom-filter-cpp": "https://github.com/brave/bloom-filter-cpp.git@9be5c63b14e094156e00c8b28f205e7794f0b92c",
diff --git a/browser/extensions/brave_component_loader.cc b/browser/extensions/brave_component_loader.cc
index 27ce4c616f51..a742a3b6fb5a 100644
--- a/browser/extensions/brave_component_loader.cc
+++ b/browser/extensions/brave_component_loader.cc
@@ -25,17 +25,6 @@
 
 namespace extensions {
 
-// static
-bool BraveComponentLoader::IsPdfjsDisabled() {
-#if defined(OS_ANDROID)
-  return true;
-#else
-  const base::CommandLine& command_line =
-    *base::CommandLine::ForCurrentProcess();
-  return command_line.HasSwitch(switches::kDisablePDFJSExtension);
-#endif
-}
-
 BraveComponentLoader::BraveComponentLoader(
     ExtensionServiceInterface* extension_service,
     PrefService* profile_prefs,
@@ -43,12 +32,7 @@ BraveComponentLoader::BraveComponentLoader(
     Profile* profile)
     : ComponentLoader(extension_service, profile_prefs, local_state, profile),
       profile_(profile),
-      profile_prefs_(profile_prefs),
-      testing_callbacks_(nullptr) {
-// TODO(bridiver) - this doesn't belong here
-#if !defined(OS_ANDROID)
-  ObserveOpenPdfExternallySetting();
-#endif
+      profile_prefs_(profile_prefs) {
 }
 
 BraveComponentLoader::~BraveComponentLoader() {
@@ -105,12 +89,6 @@ void BraveComponentLoader::AddDefaultComponentExtensions(
     Add(IDR_BRAVE_EXTENSION, brave_extension_path);
   }
 
-  if (!profile_prefs_->GetBoolean(prefs::kPluginsAlwaysOpenPdfExternally) &&
-      !command_line.HasSwitch(switches::kDisablePDFJSExtension)) {
-    AddExtension(pdfjs_extension_id, pdfjs_extension_name,
-                 pdfjs_extension_public_key);
-  }
-
 #if BUILDFLAG(BRAVE_REWARDS_ENABLED)
   if (!command_line.HasSwitch(switches::kDisableBraveRewardsExtension)) {
     base::FilePath brave_rewards_path(FILE_PATH_LITERAL(""));
@@ -130,39 +108,4 @@ void BraveComponentLoader::AddDefaultComponentExtensions(
   }
 }
 
-#if !defined(OS_ANDROID)
-void BraveComponentLoader::ObserveOpenPdfExternallySetting() {
-  // Observe the setting change only in regular profiles since the PDF settings
-  // page is not available in Guest/Tor profiles.
-  DCHECK(profile_ && profile_prefs_);
-  if (!profile_->IsGuestSession()) {
-    registrar_.Init(profile_prefs_);
-    registrar_.Add(prefs::kPluginsAlwaysOpenPdfExternally,
-      base::Bind(&BraveComponentLoader::UpdatePdfExtension,
-        base::Unretained(this)));
-  }
-}
-#endif
-
-void BraveComponentLoader::UpdatePdfExtension(const std::string& pref_name) {
-  DCHECK(pref_name == prefs::kPluginsAlwaysOpenPdfExternally);
-  DCHECK(profile_prefs_);
-  if (profile_prefs_->GetBoolean(prefs::kPluginsAlwaysOpenPdfExternally) ||
-      IsPdfjsDisabled()) {
-    if (testing_callbacks_)
-      testing_callbacks_->OnPdfExtensionAction(TestingCallbacks::WILL_REMOVE);
-    Remove(pdfjs_extension_id);
-  } else if (!Exists(pdfjs_extension_id)) {
-    if (testing_callbacks_)
-      testing_callbacks_->OnPdfExtensionAction(TestingCallbacks::WILL_ADD);
-    AddExtension(pdfjs_extension_id, pdfjs_extension_name,
-                 pdfjs_extension_public_key);
-  }
-}
-
-void BraveComponentLoader::set_testing_callbacks(
-    TestingCallbacks* testing_callbacks) {
-  testing_callbacks_ = testing_callbacks;
-}
-
 }  // namespace extensions
diff --git a/browser/extensions/brave_component_loader.h b/browser/extensions/brave_component_loader.h
index 8bd95731a4f4..414f5bc6c9cc 100644
--- a/browser/extensions/brave_component_loader.h
+++ b/browser/extensions/brave_component_loader.h
@@ -12,8 +12,6 @@
 #include "chrome/browser/extensions/component_loader.h"
 #include "components/prefs/pref_change_registrar.h"
 
-class BraveComponentLoaderTest;
-
 namespace extensions {
 
 // For registering, loading, and unloading component extensions.
@@ -41,34 +39,15 @@ class BraveComponentLoader : public ComponentLoader {
   // hangouts is set.  If the buildflag is not set, it won't add though.
   void ForceAddHangoutServicesExtension();
 
-  static bool IsPdfjsDisabled();
-
  private:
 #if BUILDFLAG(ENABLE_HANGOUT_SERVICES_EXTENSION)
   void AddHangoutServicesExtension() override;
 #endif  // BUILDFLAG(ENABLE_HANGOUT_SERVICES_EXTENSION)
-  friend class ::BraveComponentLoaderTest;
-#if !defined(OS_ANDROID)
-  void ObserveOpenPdfExternallySetting();
-#endif
-  // Callback for changes to the AlwaysOpenPdfExternally setting.
-  void UpdatePdfExtension(const std::string& pref_name);
-
-  struct TestingCallbacks {
-    enum PdfExtensionAction {
-      NONE,
-      WILL_ADD,
-      WILL_REMOVE,
-    };
-    virtual void OnPdfExtensionAction(PdfExtensionAction action) = 0;
-  };
-
-  void set_testing_callbacks(TestingCallbacks* testing_callbacks);
 
   Profile* profile_;
   PrefService* profile_prefs_;
   PrefChangeRegistrar registrar_;
-  TestingCallbacks* testing_callbacks_;
+
   DISALLOW_COPY_AND_ASSIGN(BraveComponentLoader);
 };
 
diff --git a/browser/extensions/brave_component_loader_browsertest.cc b/browser/extensions/brave_component_loader_browsertest.cc
deleted file mode 100644
index b7c327d3fd69..000000000000
--- a/browser/extensions/brave_component_loader_browsertest.cc
+++ /dev/null
@@ -1,94 +0,0 @@
-/* Copyright (c) 2019 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "brave/browser/extensions/brave_component_loader.h"
-#include "brave/browser/extensions/brave_extension_functional_test.h"
-#include "brave/common/brave_switches.h"
-#include "brave/common/pref_names.h"
-#include "brave/common/extensions/extension_constants.h"
-#include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/ui/browser.h"
-#include "chrome/common/pref_names.h"
-#include "components/prefs/pref_service.h"
-#include "content/public/test/browser_test_utils.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-using extensions::BraveComponentLoader;
-
-class BraveComponentLoaderTest : public extensions::ExtensionFunctionalTest,
-  public BraveComponentLoader::TestingCallbacks {
- public:
-  BraveComponentLoaderTest() : pdf_extension_action_(TestingCallbacks::NONE) {}
-  ~BraveComponentLoaderTest() override = default;
-
- protected:
-  void SetUpOnMainThread() override {
-    extensions::ExtensionService* service =
-      extensions::ExtensionSystem::Get(profile())->extension_service();
-    DCHECK(service);
-    BraveComponentLoader* loader =
-      static_cast<BraveComponentLoader*>(service->component_loader());
-    loader->set_testing_callbacks(this);
-  }
-
-  // BraveComponentLoader::TestingCallbacks
-  void OnPdfExtensionAction(
-      TestingCallbacks::PdfExtensionAction action) override {
-    pdf_extension_action_ = action;
-  }
-
-  TestingCallbacks::PdfExtensionAction pdf_extension_action() {
-    return pdf_extension_action_;
-  }
-
- private:
-  TestingCallbacks::PdfExtensionAction pdf_extension_action_;
-};
-
-class BravePDFExtensionTest : public BraveComponentLoaderTest {
- public:
-  BravePDFExtensionTest() {}
-  ~BravePDFExtensionTest() override = default;
-
-  void SetDownloadPDFs(bool value) {
-    DCHECK(browser());
-    profile()->GetPrefs()->SetBoolean(prefs::kPluginsAlwaysOpenPdfExternally,
-                                      value);
-  }
-};
-
-IN_PROC_BROWSER_TEST_F(BravePDFExtensionTest, ToggleDownloadPDFs) {
-  // Set preference to always download PDFs.
-  SetDownloadPDFs(true);
-  EXPECT_EQ(TestingCallbacks::WILL_REMOVE, pdf_extension_action());
-
-  // Toggle the preference to view PDFs in the browser.
-  SetDownloadPDFs(false);
-  EXPECT_EQ(TestingCallbacks::WILL_ADD, pdf_extension_action());
-}
-
-class BravePDFExtensionDisabledTest : public BravePDFExtensionTest {
- public:
-  BravePDFExtensionDisabledTest() = default;
-  ~BravePDFExtensionDisabledTest() override = default;
-
- protected:
-  void SetUpCommandLine(base::CommandLine* command_line) override {
-    ExtensionFunctionalTest::SetUpCommandLine(command_line);
-    // Disable loading of our PDF extension.
-    command_line->AppendSwitch(switches::kDisablePDFJSExtension);
-  }
-};
-
-IN_PROC_BROWSER_TEST_F(BravePDFExtensionDisabledTest, ToggleDownloadPDFs) {
-  // Set preference to always download PDFs.
-  SetDownloadPDFs(true);
-  EXPECT_EQ(TestingCallbacks::WILL_REMOVE, pdf_extension_action());
-
-  // Toggle the preference to view PDFs in the browser.
-  SetDownloadPDFs(false);
-  EXPECT_EQ(TestingCallbacks::WILL_REMOVE, pdf_extension_action());
-}
diff --git a/browser/extensions/brave_extension_provider.cc b/browser/extensions/brave_extension_provider.cc
index 2db1f5ca1031..d72e8aefd772 100644
--- a/browser/extensions/brave_extension_provider.cc
+++ b/browser/extensions/brave_extension_provider.cc
@@ -27,8 +27,7 @@ bool IsBlacklisted(const extensions::Extension* extension) {
       {// Used for tests, corresponds to
        // brave/test/data/should-be-blocked-extension.
        "mlklomjnahgiddgfdgjhibinlfibfffc",
-       // Chromium PDF Viewer.
-       "mhjfbmdgcfjbbpaeojofohoefgiehjai"});
+     });
 
   if (std::find(blacklisted_extensions.begin(), blacklisted_extensions.end(),
                 extension->id()) != blacklisted_extensions.end())
@@ -58,7 +57,6 @@ bool BraveExtensionProvider::IsVetted(const std::string id) {
       brave_sync_extension_id,
       brave_webtorrent_extension_id,
       crl_set_extension_id,
-      pdfjs_extension_id,
       hangouts_extension_id,
       widevine_extension_id,
       brave_component_updater::kLocalDataFilesComponentId,
@@ -79,6 +77,8 @@ bool BraveExtensionProvider::IsVetted(const std::string id) {
       "bhlmpjhncoojbkemjkeppfahkglffilp",
       // Test ID: Brave Tor Client Updater
       "ngicbhhaldfdgmjhilmnleppfpmkgbbk",
+      // Chromium PDF Viewer.
+      "mhjfbmdgcfjbbpaeojofohoefgiehjai",
   });
   if (std::find(vetted_extensions.begin(), vetted_extensions.end(), id) !=
       vetted_extensions.end())
diff --git a/browser/extensions/brave_extension_provider_browsertest.cc b/browser/extensions/brave_extension_provider_browsertest.cc
index 9dc1fc3fddcc..41f3996932f6 100644
--- a/browser/extensions/brave_extension_provider_browsertest.cc
+++ b/browser/extensions/brave_extension_provider_browsertest.cc
@@ -44,34 +44,6 @@ IN_PROC_BROWSER_TEST_F(BraveExtensionProviderTest, WhitelistedExtension) {
   ASSERT_TRUE(extension);
 }
 
-IN_PROC_BROWSER_TEST_F(BraveExtensionProviderTest, PDFJSInstalls) {
-  base::FilePath test_data_dir;
-  GetTestDataDir(&test_data_dir);
-  InstallExtensionSilently(extension_service(),
-      test_data_dir.AppendASCII("pdfjs.crx"));
-
-  content::WebContents* contents =
-      browser()->tab_strip_model()->GetActiveWebContents();
-  GURL url = embedded_test_server()->GetURL("/test.pdf");
-  ui_test_utils::NavigateToURL(browser(), url);
-  ASSERT_TRUE(WaitForLoadStop(contents));
-
-  // Test.pdf is just a PDF file for an icon with title test.ico
-  base::string16 expected_title(base::ASCIIToUTF16("test.ico - test.pdf"));
-    content::TitleWatcher title_watcher(
-        browser()->tab_strip_model()->GetActiveWebContents(), expected_title);
-  ui_test_utils::NavigateToURL(browser(), url);
-  EXPECT_EQ(expected_title, title_watcher.WaitAndGetTitle());
-
-  // Make sure pdfjs embed exists
-  bool pdfjs_exists;
-  ASSERT_TRUE(content::ExecuteScriptAndExtractBool(
-      browser()->tab_strip_model()->GetWebContentsAt(0),
-      "window.domAutomationController.send("
-        "!!document.body.querySelector(\"#chrome-pdfjs-logo-bg\"))", &pdfjs_exists));
-  ASSERT_TRUE(pdfjs_exists);
-}
-
 // Load an extension page with an ad image, and make sure it is NOT blocked.
 // It would otherwise be blocked though if it wasn't an extension.
 IN_PROC_BROWSER_TEST_F(BraveExtensionProviderTest, AdsNotBlockedByDefaultBlockerInExtension) {
diff --git a/browser/ui/webui/brave_settings_ui.cc b/browser/ui/webui/brave_settings_ui.cc
index 7e82004b3a3b..47e5c3d9e5dc 100644
--- a/browser/ui/webui/brave_settings_ui.cc
+++ b/browser/ui/webui/brave_settings_ui.cc
@@ -49,8 +49,6 @@ void BraveSettingsUI::AddResources(content::WebUIDataSource* html_source,
                                  kBraveSettingsResources[i].value);
   }
 
-  html_source->AddBoolean("isPdfjsDisabled",
-                          extensions::BraveComponentLoader::IsPdfjsDisabled());
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
   html_source->AddBoolean("isSyncDisabled",
diff --git a/chromium_src/chrome/browser/extensions/component_extensions_whitelist/whitelist.cc b/chromium_src/chrome/browser/extensions/component_extensions_whitelist/whitelist.cc
index 730c27ef15b3..ed04427ead05 100644
--- a/chromium_src/chrome/browser/extensions/component_extensions_whitelist/whitelist.cc
+++ b/chromium_src/chrome/browser/extensions/component_extensions_whitelist/whitelist.cc
@@ -20,7 +20,6 @@ namespace extensions {
   bool IsComponentExtensionWhitelisted(const std::string& extension_id) {
     const char* const kAllowed[] = {
       brave_extension_id,
-      pdfjs_extension_id,
       brave_rewards_extension_id,
       brave_sync_extension_id,
       brave_webtorrent_extension_id
diff --git a/chromium_src/chrome/common/extensions/chrome_manifest_handlers.cc b/chromium_src/chrome/common/extensions/chrome_manifest_handlers.cc
deleted file mode 100644
index 5a6fa9843c6c..000000000000
--- a/chromium_src/chrome/common/extensions/chrome_manifest_handlers.cc
+++ /dev/null
@@ -1,11 +0,0 @@
-/*  Copyright (c) 2019 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "brave/common/extensions/manifest_handlers/pdfjs_manifest_override.h"
-
-#define ExtensionActionHandler PDFJSOverridesHandler
-#include "../../../../../chrome/common/extensions/chrome_manifest_handlers.cc"  // NOLINT
-#undef ExtensionActionHandler
-
diff --git a/chromium_src/content/browser/renderer_host/render_process_host_impl.cc b/chromium_src/content/browser/renderer_host/render_process_host_impl.cc
deleted file mode 100644
index ccc572863192..000000000000
--- a/chromium_src/content/browser/renderer_host/render_process_host_impl.cc
+++ /dev/null
@@ -1,10 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "brave/content/browser/renderer_host/brave_plugin_registry_impl.h"
-#include "content/browser/renderer_host/plugin_registry_impl.h"
-
-#define PluginRegistryImpl BravePluginRegistryImpl
-#include "../../../../../content/browser/renderer_host/render_process_host_impl.cc"
-#undef PluginRegistryImpl
diff --git a/chromium_src/extensions/common/manifest_handlers/mime_types_handler.cc b/chromium_src/extensions/common/manifest_handlers/mime_types_handler.cc
deleted file mode 100644
index 921b5373aa23..000000000000
--- a/chromium_src/extensions/common/manifest_handlers/mime_types_handler.cc
+++ /dev/null
@@ -1,16 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
-* License, v. 2.0. If a copy of the MPL was not distributed with this file,
-* You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "../../../../extensions/common/manifest_handlers/mime_types_handler.cc"
-
-// static
-std::vector<std::string> MimeTypesHandler::BraveGetMIMETypeWhitelist() {
-  std::vector<std::string> whitelist = MimeTypesHandler::GetMIMETypeWhitelist();
-  auto pos = std::find(whitelist.begin(), whitelist.end(),
-                       extension_misc::kPdfExtensionId);
-  if (pos != whitelist.end())
-    whitelist.erase(pos);
-  return whitelist;
-}
-
diff --git a/chromium_src/third_party/blink/renderer/modules/plugins/navigator_pluginstest.cc b/chromium_src/third_party/blink/renderer/modules/plugins/navigator_pluginstest.cc
deleted file mode 100644
index d4c66083384d..000000000000
--- a/chromium_src/third_party/blink/renderer/modules/plugins/navigator_pluginstest.cc
+++ /dev/null
@@ -1,125 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "base/path_service.h"
-#include "brave/browser/brave_content_browser_client.h"
-#include "brave/common/brave_paths.h"
-#include "chrome/browser/content_settings/host_content_settings_map_factory.h"
-#include "chrome/browser/ui/browser.h"
-#include "chrome/common/chrome_content_client.h"
-#include "chrome/test/base/in_process_browser_test.h"
-#include "chrome/test/base/ui_test_utils.h"
-#include "components/content_settings/core/browser/host_content_settings_map.h"
-#include "components/content_settings/core/common/content_settings.h"
-#include "components/content_settings/core/common/content_settings_types.h"
-#include "content/public/test/browser_test_utils.h"
-
-const char kNavigatorPluginsTest[] = "/navigatorplugins.html";
-const char kNavigatorMimeTypesTest[] = "/navigatormimetypes.html";
-const char kNavigatorMimeTypesTestWithFlash[] = "/navigatormimetypeswithflash.html";
-
-const char kFlashPluginExists[] =
-  "domAutomationController.send(Array.from(navigator.plugins).filter("
-  "  x => Array.from(x).some("
-  "    y => y.type === 'application/x-shockwave-flash')).length)";
-
-class NavigatorPluginsTest : public InProcessBrowserTest {
-  public:
-    void SetUpOnMainThread() override {
-      InProcessBrowserTest::SetUpOnMainThread();
-
-      content_client_.reset(new ChromeContentClient);
-      content::SetContentClient(content_client_.get());
-      browser_content_client_.reset(new BraveContentBrowserClient());
-      content::SetBrowserClientForTesting(browser_content_client_.get());
-      content::SetupCrossSiteRedirector(embedded_test_server());
-
-      brave::RegisterPathProvider();
-      base::FilePath test_data_dir;
-      base::PathService::Get(brave::DIR_TEST_DATA, &test_data_dir);
-      embedded_test_server()->ServeFilesFromDirectory(test_data_dir);
-
-      ASSERT_TRUE(embedded_test_server()->Start());
-    }
-
-    HostContentSettingsMap * content_settings() {
-      return HostContentSettingsMapFactory::GetForProfile(browser()->profile());
-    }
-
-    void AllowFlash(GURL url) {
-      content_settings()->SetContentSettingCustomScope(
-          ContentSettingsPattern::FromString(url.spec()),
-          ContentSettingsPattern::Wildcard(),
-          CONTENT_SETTINGS_TYPE_PLUGINS,
-          std::string(),
-          CONTENT_SETTING_ALLOW);
-    }
-
-    void TearDown() override {
-      browser_content_client_.reset();
-      content_client_.reset();
-    }
-
-  private:
-    std::unique_ptr<ChromeContentClient> content_client_;
-    std::unique_ptr<BraveContentBrowserClient> browser_content_client_;
-    base::ScopedTempDir temp_user_data_dir_;
-};
-
-IN_PROC_BROWSER_TEST_F(NavigatorPluginsTest, ConstPluginsWithoutFlash) {
-  GURL url = embedded_test_server()->GetURL(kNavigatorPluginsTest);
-  ui_test_utils::NavigateToURL(browser(), url);
-  content::WebContents* contents = browser()->tab_strip_model()->GetActiveWebContents();
-  ASSERT_TRUE(content::WaitForLoadStop(contents));
-  EXPECT_EQ(url, contents->GetURL());
-
-  bool constantPlugins;
-  ASSERT_TRUE(ExecuteScriptAndExtractBool(
-      contents,
-      "window.domAutomationController.send(constantPlugins())",
-      &constantPlugins));
-  EXPECT_TRUE(constantPlugins);
-}
-
-IN_PROC_BROWSER_TEST_F(NavigatorPluginsTest, ConstMimeTypesWithoutFlash) {
-  GURL url = embedded_test_server()->GetURL(kNavigatorMimeTypesTest);
-  ui_test_utils::NavigateToURL(browser(), url);
-  content::WebContents* contents = browser()->tab_strip_model()->GetActiveWebContents();
-  ASSERT_TRUE(content::WaitForLoadStop(contents));
-  EXPECT_EQ(url, contents->GetURL());
-
-  bool constantMimeTypes;
-  ASSERT_TRUE(ExecuteScriptAndExtractBool(
-      contents,
-      "window.domAutomationController.send(constantMimeTypes())",
-      &constantMimeTypes));
-  EXPECT_TRUE(constantMimeTypes);
-}
-
-
-IN_PROC_BROWSER_TEST_F(NavigatorPluginsTest, ConstPluginsAndMimeTypesWithFlash) {
-  int len;
-  GURL url = embedded_test_server()->GetURL(kNavigatorMimeTypesTestWithFlash);
-  AllowFlash(url);
-  ui_test_utils::NavigateToURL(browser(), url);
-  content::WebContents* contents = browser()->tab_strip_model()->GetActiveWebContents();
-  ASSERT_TRUE(content::WaitForLoadStop(contents));
-  EXPECT_EQ(url, contents->GetURL());
-
-  ASSERT_TRUE(ExecuteScriptAndExtractInt(contents, 
-    kFlashPluginExists, &len));
-  ASSERT_LE(len, 1);
-
-  // If len == 0, flash is not installed. Skip this test
-  if (len == 0) {
-    return;
-  }
-
-  bool constantMimeTypes;
-  ASSERT_TRUE(ExecuteScriptAndExtractBool(
-      contents,
-      "window.domAutomationController.send(constantMimeTypes())",
-      &constantMimeTypes));
-  EXPECT_TRUE(constantMimeTypes);
-}
\ No newline at end of file
diff --git a/common/BUILD.gn b/common/BUILD.gn
index 5f9874d4173b..8f2c287b1d73 100644
--- a/common/BUILD.gn
+++ b/common/BUILD.gn
@@ -65,8 +65,6 @@ source_set("common") {
       "extensions/brave_extensions_api_provider.h",
       "extensions/extension_constants.cc",
       "extensions/extension_constants.h",
-      "extensions/manifest_handlers/pdfjs_manifest_override.cc",
-      "extensions/manifest_handlers/pdfjs_manifest_override.h",
     ]
 
     public_deps = [
diff --git a/common/brave_switches.cc b/common/brave_switches.cc
index 00c86abab79b..f518e2b54ed5 100644
--- a/common/brave_switches.cc
+++ b/common/brave_switches.cc
@@ -22,9 +22,6 @@ const char kDisableBraveUpdate[] = "disable-brave-update";
 const char kDisableChromeGoogleURLTrackingClient[] =
     "disable-chrome-google-url-tracking-client";
 
-// Allows disabling the PDFJS extension.
-const char kDisablePDFJSExtension[] = "disable-pdfjs-extension";
-
 // Allows disabling the Tor client updater extension.
 const char kDisableTorClientUpdaterExtension[] =
     "disable-tor-client-updater-extension";
diff --git a/common/brave_switches.h b/common/brave_switches.h
index 61404a837d18..82350f918351 100644
--- a/common/brave_switches.h
+++ b/common/brave_switches.h
@@ -18,8 +18,6 @@ extern const char kDisableBraveUpdate[];
 
 extern const char kDisableChromeGoogleURLTrackingClient[];
 
-extern const char kDisablePDFJSExtension[];
-
 extern const char kDisableTorClientUpdaterExtension[];
 
 extern const char kDisableWebTorrentExtension[];
diff --git a/common/extensions/brave_pdf_download_browsertest.cc b/common/extensions/brave_pdf_download_browsertest.cc
deleted file mode 100644
index 2e2fe5f7e429..000000000000
--- a/common/extensions/brave_pdf_download_browsertest.cc
+++ /dev/null
@@ -1,211 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
-* License, v. 2.0. If a copy of the MPL was not distributed with this file,
-* You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "base/run_loop.h"
-#include "base/task/post_task.h"
-#include "brave/browser/brave_browser_process_impl.h"
-#include "brave/browser/extensions/brave_extension_functional_test.h"
-#include "brave/common/extensions/extension_constants.h"
-#include "chrome/browser/plugins/plugin_utils.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/ui/browser.h"
-#include "chrome/common/pdf_util.h"
-#include "chrome/common/pref_names.h"
-#include "chrome/test/base/ui_test_utils.h"
-#include "content/public/browser/browser_context.h"
-#include "content/public/browser/browser_task_traits.h"
-#include "content/public/browser/download_manager.h"
-#include "content/public/browser/resource_context.h"
-#include "content/public/test/browser_test_utils.h"
-#include "content/public/test/test_utils.h"
-#include "extensions/browser/extension_registry.h"
-#include "extensions/common/constants.h"
-#include "extensions/common/manifest_handlers/mime_types_handler.h"
-#include "net/url_request/url_request_context.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-using content::BrowserThread;
-using extensions::ExtensionRegistry;
-
-namespace {
-
-class DownloadManagerObserverHelper
-    : public content::DownloadManager::Observer {
- public:
-  DownloadManagerObserverHelper(Browser* browser)
-      : browser_(browser), download_manager_(nullptr) {
-    // Set preference to not ask where to save downloads.
-    browser_->profile()->GetPrefs()->SetBoolean(prefs::kPromptForDownload,
-                                                false);
-  }
-
-  ~DownloadManagerObserverHelper() override {
-    if (download_manager_)
-      download_manager_->RemoveObserver(this);
-  }
-
-  void Observe() {
-    // Register a download observer.
-    content::WebContents* contents =
-        browser_->tab_strip_model()->GetActiveWebContents();
-    content::BrowserContext* browser_context = contents->GetBrowserContext();
-    download_manager_ =
-        content::BrowserContext::GetDownloadManager(browser_context);
-    download_manager_->AddObserver(this);
-  }
-
-  void CheckForDownload(const GURL& url) {
-    // Wait for the url to load and check that it loaded.
-    ASSERT_EQ(url, GetLastUrl());
-    // Check that one download has been initiated.
-    DCHECK(download_manager_);
-    std::vector<download::DownloadItem*> downloads;
-    download_manager_->GetAllDownloads(&downloads);
-    ASSERT_EQ(1u, downloads.size());
-    // Cancel download to shut down cleanly.
-    downloads[0]->Cancel(false);
-  }
-
-  const GURL& GetLastUrl() {
-    // Wait until the download has been created.
-    download_run_loop_.Run();
-    return last_url_;
-  }
-
-  // content::DownloadManager::Observer implementation.
-  void OnDownloadCreated(content::DownloadManager* manager,
-                         download::DownloadItem* item) override {
-    last_url_ = item->GetURL();
-    download_run_loop_.Quit();
-  }
-
- private:
-  Browser* browser_;
-  content::DownloadManager* download_manager_;
-  content::NotificationRegistrar registrar_;
-  base::RunLoop download_run_loop_;
-  GURL last_url_;
-};
-
-class IOHelper {
-public: 
-  IOHelper(Browser* browser)
-     : finished_(false),
-       id_("junk"),
-       resource_context_(browser->profile()->GetResourceContext()) {}
-  ~IOHelper() = default;
-
-  void GetExtensionIdForPdf() {
-    base::PostTaskWithTraitsAndReply(
-        FROM_HERE, {BrowserThread::IO},
-        base::Bind(&IOHelper::GetExtensionIdForPdfOnIOThread,
-                   base::Unretained(this)),
-        base::Bind(&IOHelper::OnFinished, base::Unretained(this)));
-
-    if (!finished_)
-      run_loop_.Run();
-  }
-
-  void GetExtensionIdForPdfOnIOThread() {
-    id_ =
-        PluginUtils::GetExtensionIdForMimeType(resource_context_, kPDFMimeType);
-  }
-
-  void OnFinished() {
-    finished_ = true;
-    run_loop_.Quit();
-  }
-
-  std::string& id() { return id_; }
-
-private:
-  std::atomic_bool finished_;
-  std::string id_;
-  content::ResourceContext* resource_context_;
-  base::RunLoop run_loop_;
-};
-
-} //namespace
-
-class BravePDFDownloadTest : public extensions::ExtensionFunctionalTest {
-public:
-  BravePDFDownloadTest() = default;
-  ~BravePDFDownloadTest() override = default;
-
-protected:
-  bool ShouldEnableInstallVerification() override {
-    // Simulates behavior in chrome/browser/extensions/install_verifier.cc's
-    // GetExperimentStatus.
-#if (defined(OS_WIN) || defined(OS_MACOSX))
-    return true;
-#else
-    return false;
-#endif
-  }
-
-  void SetDownloadPDFs() {
-    DCHECK(browser());
-    browser()->profile()->GetPrefs()->SetBoolean(
-        prefs::kPluginsAlwaysOpenPdfExternally, true);
-  }
-
-  void CheckPDFJSExtensionNotLoaded(
-      ExtensionRegistry* registry) const {
-    // Verify that the PDFJS extension is not loaded.
-    EXPECT_FALSE(
-        registry->enabled_extensions().Contains(pdfjs_extension_id));
-  }
-
-  void CheckCantHandlePDFs(const ExtensionRegistry* registry) const {
-    // Verify that there are no extensions that can handle PDFs, except for the
-    // Chromium PDF extension which won't be considered due to what is verified
-    // in the VerifyChromiumPDFExntension test below.
-    const extensions::ExtensionSet& enabled_extensions =
-        registry->enabled_extensions();
-    for (const auto& extension : enabled_extensions) {
-      MimeTypesHandler* handler = MimeTypesHandler::GetHandler(extension.get());
-      if (handler && handler->CanHandleMIMEType(kPDFMimeType))
-        ASSERT_STREQ(handler->extension_id().c_str(),
-                     extension_misc::kPdfExtensionId);
-    }
-  }
-};
-
-IN_PROC_BROWSER_TEST_F(BravePDFDownloadTest, VerifyChromiumPDFExntension) {
-  // On Win and Mac extension install verification puts blacklisted
-  // Chromium PDF extension into disabled extensions.
-#if (defined(OS_WIN) || defined(OS_MACOSX))
-  ExtensionRegistry* registry =
-      ExtensionRegistry::Get(browser()->profile());
-  EXPECT_TRUE(
-    registry->disabled_extensions().Contains(extension_misc::kPdfExtensionId));
-#endif
-  // On all platforms we modified whitelist to make sure Chromium PDF
-  // extension is not considered for PDF handling.
-  IOHelper helper(browser());
-  helper.GetExtensionIdForPdf();
-  EXPECT_EQ(helper.id(), std::string());
-}
-
-IN_PROC_BROWSER_TEST_F(BravePDFDownloadTest, DownloadPDF) {
-  ExtensionRegistry* registry =
-      ExtensionRegistry::Get(browser()->profile());
-  CheckPDFJSExtensionNotLoaded(registry);
-
-  // Set preference to always download PDFs and check that we can't handle PDFs.
-  SetDownloadPDFs();
-  // Since in browser tests the extension is not actually loaded we don't have
-  // to wait here to ensure the extension has been unloaded.
-  CheckCantHandlePDFs(registry);
-
-  // Register a download observer.
-  DownloadManagerObserverHelper helper(browser());
-  helper.Observe();
-  // Navigate to a pdf.
-  GURL url(embedded_test_server()->GetURL("/test.pdf"));
-  ui_test_utils::NavigateToURL(browser(), url);
-  // Check that one download has been initiated.
-  helper.CheckForDownload(url);
-}
-
diff --git a/common/extensions/extension_constants.cc b/common/extensions/extension_constants.cc
index c129c9c63523..d83b0433a8fc 100644
--- a/common/extensions/extension_constants.cc
+++ b/common/extensions/extension_constants.cc
@@ -13,16 +13,6 @@ const char widevine_extension_id[] = "oimompecagnajdejgnnjijobebaeigek";
 const char brave_sync_extension_id[] = "nomlkjnggnifocmealianaaiobmebgil";
 const char crl_set_extension_id[] = "hfnkpimlhhgieaddgfemjhofmfblmnib";
 
-const char pdfjs_extension_id[] = "oemmndcbldboiebfnladdacbdfmadadm";
-const char pdfjs_extension_name[] = "PDF Viewer (PDF.js)";
-const char pdfjs_extension_public_key[] =
-    "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDb5PIb8ayK6vHvEIY1nJKRSCDE8iJ1T43qFN"
-    "+5dvCVQrmyEkgqB9ZuZNT24Lwot96HV51VoITHKRNIVKI2Nrbfn0M49t7qtaP34g/"
-    "GXJ7mAIbSzsY4+i+"
-    "Wsz8EL2SNEIw6uH8RmXG7nZ29NJ7sk7jn17QmMsO2UJ01UT8hfOOOEQIDAQAB";
-const char pdfjs_extension_origin[] =
-    "chrome-extension://oemmndcbldboiebfnladdacbdfmadadm/";
-
 const char ipfs_companion_extension_id[] = "nibjojkomfdiaoajekhjakgkdhaomnch";
 const char ipfs_companion_extension_name[] = "IPFS Companion";
 const char ipfs_companion_extension_public_key[] =
diff --git a/common/extensions/extension_constants.h b/common/extensions/extension_constants.h
index a5a8af8a23f9..5953c2c0660e 100644
--- a/common/extensions/extension_constants.h
+++ b/common/extensions/extension_constants.h
@@ -14,11 +14,6 @@ extern const char widevine_extension_id[];
 extern const char brave_sync_extension_id[];
 extern const char crl_set_extension_id[];
 
-extern const char pdfjs_extension_id[];
-extern const char pdfjs_extension_name[];
-extern const char pdfjs_extension_public_key[];
-extern const char pdfjs_extension_origin[];
-
 extern const char ipfs_companion_extension_id[];
 extern const char ipfs_companion_extension_name[];
 extern const char ipfs_companion_extension_public_key[];
diff --git a/common/extensions/manifest_handlers/pdfjs_manifest_override.cc b/common/extensions/manifest_handlers/pdfjs_manifest_override.cc
deleted file mode 100644
index b582c2fe1435..000000000000
--- a/common/extensions/manifest_handlers/pdfjs_manifest_override.cc
+++ /dev/null
@@ -1,26 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "brave/common/extensions/extension_constants.h"
-#include "brave/common/extensions/manifest_handlers/pdfjs_manifest_override.h"
-#include "chrome/common/extensions/api/extension_action/action_info.h"
-#include "extensions/common/extension.h"
-
-namespace extensions {
-
-PDFJSOverridesHandler::PDFJSOverridesHandler() {
-}
-
-PDFJSOverridesHandler::~PDFJSOverridesHandler() {
-}
-
-bool PDFJSOverridesHandler::Parse(Extension* extension, base::string16* error) {
-  bool result = ExtensionActionHandler::Parse(extension, error);
-  if (extension && extension->id() == pdfjs_extension_id) {
-    ActionInfo::SetPageActionInfo(extension, nullptr);
-  }
-  return result;
-}
-
-}  // namespace extensions
diff --git a/common/extensions/manifest_handlers/pdfjs_manifest_override.h b/common/extensions/manifest_handlers/pdfjs_manifest_override.h
deleted file mode 100644
index 9630ff21cb48..000000000000
--- a/common/extensions/manifest_handlers/pdfjs_manifest_override.h
+++ /dev/null
@@ -1,26 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef BRAVE_COMMON_EXTENSIONS_MANIFEST_HANDLERS_PDFJS_OVERRIDES_HANDLER_H_
-#define BRAVE_COMMON_EXTENSIONS_MANIFEST_HANDLERS_PDFJS_OVERRIDES_HANDLER_H_
-
-#include "chrome/common/extensions/manifest_handlers/extension_action_handler.h"
-
-namespace extensions {
-
-// We want PDFJS, but we don't want the PDFJS page action
-// This needs to be a subclass because you can't have 2 manifest handlers
-// for the same keys.
-class PDFJSOverridesHandler : public ExtensionActionHandler {
- public:
-  PDFJSOverridesHandler();
-  ~PDFJSOverridesHandler() override;
-  bool Parse(Extension* extension, base::string16* error) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PDFJSOverridesHandler);
-};
-
-}  // namespace extensions
-#endif  // BRAVE_COMMON_EXTENSIONS_MANIFEST_HANDLERS_PDFJS_OVERRIDES_HANDLER_H_
diff --git a/content/browser/renderer_host/brave_plugin_registry_impl.cc b/content/browser/renderer_host/brave_plugin_registry_impl.cc
deleted file mode 100644
index 5cb6e4724024..000000000000
--- a/content/browser/renderer_host/brave_plugin_registry_impl.cc
+++ /dev/null
@@ -1,39 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "brave/content/browser/renderer_host/brave_plugin_registry_impl.h"
-
-#include "base/strings/utf_string_conversions.h"
-#include "content/public/common/content_constants.h"
-
-namespace content {
-
-BravePluginRegistryImpl::BravePluginRegistryImpl(ResourceContext* resource_context)
-    : PluginRegistryImpl(resource_context) {}
-
-BravePluginRegistryImpl::~BravePluginRegistryImpl() {}
-
-void BravePluginRegistryImpl::GetPluginsComplete(GetPluginsCallback callback, 
-  std::vector<blink::mojom::PluginInfoPtr> plugins) {
-  std::vector<blink::mojom::PluginInfoPtr> filtered_plugins;
-
-  for(std::vector<blink::mojom::PluginInfoPtr>::iterator it = plugins.begin(); 
-    it != plugins.end(); ++it) {
-    if ((*it) && (*it)->name == base::ASCIIToUTF16(kFlashPluginName)) {
-      filtered_plugins.push_back(std::move(*it));
-    }
-  }
-  std::move(callback).Run(std::move(filtered_plugins));
-}
-
-void BravePluginRegistryImpl::GetPlugins(bool refresh,
-                                    const url::Origin& main_frame_origin,
-                                    GetPluginsCallback callback) {
-  PluginRegistryImpl::GetPlugins(refresh, main_frame_origin,
-    base::BindOnce(
-      &BravePluginRegistryImpl::GetPluginsComplete, base::Unretained(this), 
-      std::move(callback)));
-}
-
-}  // namespace content
\ No newline at end of file
diff --git a/content/browser/renderer_host/brave_plugin_registry_impl.h b/content/browser/renderer_host/brave_plugin_registry_impl.h
deleted file mode 100644
index 4010ba1659fc..000000000000
--- a/content/browser/renderer_host/brave_plugin_registry_impl.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef BRAVE_CONTENT_BROWSER_RENDERER_HOST_PLUGIN_REGISTRY_IMPL_H_
-#define BRAVE_CONTENT_BROWSER_RENDERER_HOST_PLUGIN_REGISTRY_IMPL_H_
-
-#include "content/browser/renderer_host/plugin_registry_impl.h"
-
-namespace content {
-
-class ResourceContext;
-
-class BravePluginRegistryImpl : public PluginRegistryImpl {
- public:
-  BravePluginRegistryImpl(ResourceContext* resource_context);
-  ~BravePluginRegistryImpl() override;
-
-  void GetPlugins(bool refresh,
-                  const url::Origin& main_frame_origin,
-                  GetPluginsCallback callback) override;
- private:
-  void GetPluginsComplete(GetPluginsCallback callback,
-    std::vector<blink::mojom::PluginInfoPtr> plugins);
-};
-
-}  // namespace content
-
-#endif  // BRAVE_CONTENT_BROWSER_RENDERER_HOST_PLUGIN_REGISTRY_IMPL_H_
\ No newline at end of file
diff --git a/patches/chrome-browser-extensions-install_verifier.cc.patch b/patches/chrome-browser-extensions-install_verifier.cc.patch
deleted file mode 100644
index 8b113d7c6788..000000000000
--- a/patches/chrome-browser-extensions-install_verifier.cc.patch
+++ /dev/null
@@ -1,23 +0,0 @@
-diff --git a/chrome/browser/extensions/install_verifier.cc b/chrome/browser/extensions/install_verifier.cc
-index 23b122e8627a262388927734317a1582b73542ff..d8ed84fe97b9000b38db1cd1dffa9c410ccb2df4 100644
---- a/chrome/browser/extensions/install_verifier.cc
-+++ b/chrome/browser/extensions/install_verifier.cc
-@@ -16,6 +16,7 @@
- #include "base/one_shot_event.h"
- #include "base/stl_util.h"
- #include "base/trace_event/trace_event.h"
-+#include "brave/common/extensions/extension_constants.h"
- #include "build/build_config.h"
- #include "chrome/browser/extensions/extension_management.h"
- #include "chrome/browser/extensions/extension_service.h"
-@@ -213,6 +214,10 @@ bool InstallVerifier::NeedsVerification(const Extension& extension) {
- 
- // static
- bool InstallVerifier::IsFromStore(const Extension& extension) {
-+  // Do not fetch signatures for PDFJS which is hosted by Brave, not CWS
-+  if (extension.id() == pdfjs_extension_id) {
-+    return false;
-+  }
-   return extension.from_webstore() ||
-          ManifestURL::UpdatesFromGallery(&extension);
- }
diff --git a/patches/chrome-browser-plugins-plugin_utils.cc.patch b/patches/chrome-browser-plugins-plugin_utils.cc.patch
deleted file mode 100644
index 950008b2643a..000000000000
--- a/patches/chrome-browser-plugins-plugin_utils.cc.patch
+++ /dev/null
@@ -1,14 +0,0 @@
-diff --git a/chrome/browser/plugins/plugin_utils.cc b/chrome/browser/plugins/plugin_utils.cc
-index 01ea0ba7f0cb8a1ce2ee56a1a918d200159b4994..d77a8289ec8b07179b1ba2e89701d1132cd5920f 100644
---- a/chrome/browser/plugins/plugin_utils.cc
-+++ b/chrome/browser/plugins/plugin_utils.cc
-@@ -184,7 +184,8 @@ PluginUtils::GetMimeTypeToExtensionIdMap(
-   bool profile_is_off_the_record = io_data->IsOffTheRecord();
-   const scoped_refptr<const extensions::InfoMap> extension_info_map(
-       io_data->GetExtensionInfoMap());
--  std::vector<std::string> whitelist = MimeTypesHandler::GetMIMETypeWhitelist();
-+  std::vector<std::string> whitelist =
-+      MimeTypesHandler::BraveGetMIMETypeWhitelist();
-   // Go through the white-listed extensions and try to use them to intercept
-   // the URL request.
-   for (const std::string& extension_id : whitelist) {
diff --git a/patches/chrome-browser-resources-settings-site_settings-pdf_documents.js.patch b/patches/chrome-browser-resources-settings-site_settings-pdf_documents.js.patch
deleted file mode 100644
index 8f5cf649fa18..000000000000
--- a/patches/chrome-browser-resources-settings-site_settings-pdf_documents.js.patch
+++ /dev/null
@@ -1,17 +0,0 @@
-diff --git a/chrome/browser/resources/settings/site_settings/pdf_documents.js b/chrome/browser/resources/settings/site_settings/pdf_documents.js
-index 66f61a6db59bc5a549db3ec505518462f72b5cb7..dc96ac708d68be5f82972aa3273e38ce687b61ab 100644
---- a/chrome/browser/resources/settings/site_settings/pdf_documents.js
-+++ b/chrome/browser/resources/settings/site_settings/pdf_documents.js
-@@ -17,4 +17,12 @@ Polymer({
-       notify: true,
-     },
-   },
-+
-+  /** @override */
-+  ready: function () {
-+    if (loadTimeData.getBoolean('isPdfjsDisabled')) {
-+      this.$.toggle.disabled = true;
-+      this.$.toggle.checked = true;
-+    }
-+  },
- });
diff --git a/patches/chrome-common-chrome_content_client_constants.cc.patch b/patches/chrome-common-chrome_content_client_constants.cc.patch
new file mode 100644
index 000000000000..d87ba8aa463d
--- /dev/null
+++ b/patches/chrome-common-chrome_content_client_constants.cc.patch
@@ -0,0 +1,16 @@
+diff --git a/chrome/common/chrome_content_client_constants.cc b/chrome/common/chrome_content_client_constants.cc
+index a8365688d3ea165e26bc6a9e1b1851cbacaf59b2..a4f7083b44b8c6d9614bc5f1d72ddd78ff602900 100644
+--- a/chrome/common/chrome_content_client_constants.cc
++++ b/chrome/common/chrome_content_client_constants.cc
+@@ -19,9 +19,9 @@ const char ChromeContentClient::kPDFExtensionPluginName[] = "Chrome PDF Viewer";
+ const char ChromeContentClient::kPDFInternalPluginName[] = "Chrome PDF Plugin";
+ #else
+ const char ChromeContentClient::kPDFExtensionPluginName[] =
+-    "Chromium PDF Viewer";
++    "Chrome PDF Viewer";
+ const char ChromeContentClient::kPDFInternalPluginName[] =
+-    "Chromium PDF Plugin";
++    "Chrome PDF Plugin";
+ #endif
+ 
+ const base::FilePath::CharType ChromeContentClient::kPDFPluginPath[] =
diff --git a/patches/content-browser-BUILD.gn.patch b/patches/content-browser-BUILD.gn.patch
deleted file mode 100644
index bd04f5712205..000000000000
--- a/patches/content-browser-BUILD.gn.patch
+++ /dev/null
@@ -1,17 +0,0 @@
-diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
-index 38b6a3185b14e4b2152cfa9f274c6bf0057c567e..3d6412ed7fc81529dfb2373de62aa8c1079b75cd 100644
---- a/content/browser/BUILD.gn
-+++ b/content/browser/BUILD.gn
-@@ -2208,6 +2208,12 @@ jumbo_source_set("browser") {
-       "//ppapi/proxy:ipc",
-       "//ppapi/shared_impl",
-     ]
-+    if (brave_chromium_build) {
-+      sources += [
-+        "//brave/content/browser/renderer_host/brave_plugin_registry_impl.cc",
-+        "//brave/content/browser/renderer_host/brave_plugin_registry_impl.h",
-+      ]
-+    }
-     if (is_linux) {
-       deps += [ "//components/services/font:ppapi_fontconfig_matching" ]
-     }
diff --git a/patches/extensions-common-manifest_handlers-mime_types_handler.h.patch b/patches/extensions-common-manifest_handlers-mime_types_handler.h.patch
deleted file mode 100644
index c8591f5fb133..000000000000
--- a/patches/extensions-common-manifest_handlers-mime_types_handler.h.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-diff --git a/extensions/common/manifest_handlers/mime_types_handler.h b/extensions/common/manifest_handlers/mime_types_handler.h
-index 22dfd725f130ebbd8096f7a37174d2c1ce50ff4e..9afcf52ef12e170e588e5f90a644e350c4e99bc2 100644
---- a/extensions/common/manifest_handlers/mime_types_handler.h
-+++ b/extensions/common/manifest_handlers/mime_types_handler.h
-@@ -17,6 +17,7 @@ class MimeTypesHandler {
-  public:
-   // Returns list of extensions' ids that are allowed to use MIME type filters.
-   static std::vector<std::string> GetMIMETypeWhitelist();
-+  static std::vector<std::string> BraveGetMIMETypeWhitelist();
- 
-   static MimeTypesHandler* GetHandler(const extensions::Extension* extension);
- 
diff --git a/test/BUILD.gn b/test/BUILD.gn
index d630b5df5d96..1a8d38d7cd7f 100644
--- a/test/BUILD.gn
+++ b/test/BUILD.gn
@@ -315,8 +315,6 @@ test("brave_browser_tests") {
     "//brave/chromium_src/components/content_settings/core/browser/brave_content_settings_registry_browsertest.cc",
     "//brave/chromium_src/third_party/blink/renderer/modules/battery/navigator_batterytest.cc",
     "//brave/chromium_src/third_party/blink/renderer/modules/bluetooth/navigator_bluetoothtest.cc",
-    "//brave/chromium_src/third_party/blink/renderer/modules/plugins/navigator_pluginstest.cc",
-    "//brave/common/extensions/brave_pdf_download_browsertest.cc",
     "//brave/browser/autoplay/autoplay_permission_context_browsertest.cc",
     "//brave/browser/brave_content_browser_client_browsertest.cc",
     "//brave/browser/brave_features_browsertest.cc",
@@ -350,7 +348,6 @@ test("brave_browser_tests") {
     "//brave/components/brave_shields/browser/https_everywhere_service_browsertest.cc",
     "//brave/components/brave_shields/browser/referrer_whitelist_service_browsertest.cc",
     "//brave/components/brave_shields/browser/tracking_protection_service_browsertest.cc",
-    "//brave/browser/extensions/brave_component_loader_browsertest.cc",
     "//brave/browser/extensions/brave_extension_provider_browsertest.cc",
     "//brave/renderer/brave_content_settings_observer_browsertest.cc",
     "//brave/renderer/brave_content_settings_observer_autoplay_browsertest.cc",
diff --git a/test/data/navigatormimetypes.html b/test/data/navigatormimetypes.html
deleted file mode 100644
index 7045499c817c..000000000000
--- a/test/data/navigatormimetypes.html
+++ /dev/null
@@ -1,5 +0,0 @@
-<script>
-  function constantMimeTypes() {
-    return navigator.mimeTypes.length == 0;
-  }
-</script>
diff --git a/test/data/navigatormimetypeswithflash.html b/test/data/navigatormimetypeswithflash.html
deleted file mode 100644
index 65c11084368b..000000000000
--- a/test/data/navigatormimetypeswithflash.html
+++ /dev/null
@@ -1,5 +0,0 @@
-<script>
-  function constantMimeTypes() {
-    return navigator.mimeTypes.length == 2;
-  }
-</script>
diff --git a/test/data/navigatorplugins.html b/test/data/navigatorplugins.html
deleted file mode 100644
index 59d8d0b53f38..000000000000
--- a/test/data/navigatorplugins.html
+++ /dev/null
@@ -1,5 +0,0 @@
-<script>
-  function constantPlugins() {
-    return navigator.plugins.length == 0;
-  }
-</script>
diff --git a/test/data/pdfjs.crx b/test/data/pdfjs.crx
deleted file mode 100644
index 2f6f388e6124..000000000000
Binary files a/test/data/pdfjs.crx and /dev/null differ
diff --git a/test/data/pdfjs.pem b/test/data/pdfjs.pem
deleted file mode 100644
index 420f2a527cd3..000000000000
--- a/test/data/pdfjs.pem
+++ /dev/null
@@ -1,28 +0,0 @@
------BEGIN PRIVATE KEY-----
-MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCgKsBrWk6QJq4a
-ZSBnm15b9Ljw92Aot3XPKGEEj5AiLwR5rVfk3sOt2vn3GbW55LwOndBJg4WOtxAb
-qERRsU/GbZQXeFCLJvrwK6o2/3wrfanzdR6aLvXX5TsQbJZ/Pdlj8PQZtcLPQZ4b
-PI9LIX/noq1QMaqLVpiOtOr7h6Ad9itVg+FwQwaM7km/TKHn5r4y/OMcdnybyV+p
-iakptt6rSjRcZNMHhw5Nl+4IyjuhYjqmIBiK3SkMO3/ne5hIwmmfr1hg3Tytk59I
-s9XjC7/mhzZ3DythaQb6P4Zt23uCTcyM+5Rq8tzdqILGaP2ze4tNJMXGdUVIURNa
-ToScQ/frAgMBAAECggEABxg9s8OpTTtZZPPrzosUT/B0LMBYcxVFU6rPOVt+n/UD
-NryV8x5m/pF/lxF9ekGGjwMwkcEQrnSvcvouJIw9I2YBNFTxBGjynqbggFUq0+Za
-G92pQF0qKKkPx7d3pyU/Nu0acvUZLwMSFNTG6CYQu1r6YF4C1u88DL441nF4hzsp
-QKFBuc2AktTTZwNMP7d/vqTTuUK9ZC1yTdQqA12si1kWrOi5NXW8IbcC3gS1iLnb
-ukwC25WWERkqnUV9rbw3cXYcvaFHh000WELHPOwfPeu/gNeiYV3z5FdZt+nlD0/M
-Y7P8KszwcEbzMbdFQUIw+PHQtScPAaSIxmZneDokSQKBgQDg1IdnAxyGRl8l4Czy
-OMQmkmSp11pgv96OxNwDF0HIW/xQ+IqrH9pXuhOjbnl2XpD7OapwEUjiKgAQE5Qz
-bxlA4+pAA/jBGxjhgHAUz9bXJtHWcOHd8RaCJc47m0vyTM893tqcz+Qb4FkTcnHb
-yJxU7fgOwYeJKd/aqB4drXLaJQKBgQC2X0E7GsQNyFTq6ySwkI6qfHoIO0fKeM/g
-kNyTrtYZITdPl8H7nsA87hHdVuRBNdHTNRpJAbJ3gFOf8B0aUHRoshvZ3Ni9e6nG
-YiLRPT0vHc1pfvpP6GaDkcDq8Uh2JJNOnSoPyYWEecrwotmBSV3TPYHBbYlHTPTB
-kHya5/kEzwKBgFq3BgcXZ0v6WuvCXwBAzUwu5zTsMog1Aoyie483tBAupUjab8EK
-MiQRbVkU+yc6ks76/n0HTFwMzEewTqzOF+dpzpuTvqvTzh82noKXNb1L6YDXvRq6
-6vUKYgME7wjN2xTAtX5uF0D0LZy+IZinggR2nA8AITrDzZHBIZ2h3WSNAoGAI5ud
-pOio9vfyfJvE4iSXdnovaYQJlGLaU8J1DvDIJMfzgLrkyThJ2JuzKUBZ+NGFUnO/
-2hlWuzZ3HXdId2bWE8sS3Qrd1sFaeL2YhroqRBTRkpOUVB3QRkgjHrxVpZuml2bg
-W4zBYQhWs31YcoHcq+4Kc7XrY9yGvXR0n9pDKMkCgYEAoijwHs+R6ypJMKXFMyZZ
-2P7hurR8g7BEu1w/DmIb5Vc7O6OLPi5PL/g1BlBUEPTRtSwXNru1R9IVOXsj2+Ei
-o2J+ALM1Z+euOsq6qYNrxEikzXAbbYcFwBvljExELkKL9EvqYTXydYYIMLT1gcj9
-soPsw/2nNHrJaxsFnyYE3nU=
------END PRIVATE KEY-----
diff --git a/test/data/test.pdf b/test/data/test.pdf
deleted file mode 100644
index 6da424d1f3fd..000000000000
Binary files a/test/data/test.pdf and /dev/null differ