Disable Media Router for sign-in and lock screen profiles

Media Router cannot be disabled for these profiles with per-profile admin policies so we'll blanket disable Media Router for them for now.

(cherry picked from commit 46aab5e)

Bug: 1380828
Change-Id: I79ddc952bdf74695a01d768eaf516fcb353b9e7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4113644
Reviewed-by: Muyao Xu <muyaoxu@google.com>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1084608}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4111812
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/5481@{#18}
Cr-Branched-From: 130f3e4-refs/heads/main@{#1084008}

chrome/browser/media/router/BUILD.gn

@@ -44,6 +44,7 @@ static_library("media_router_feature") {
   public_deps = [ "//base" ]
   deps = [
     "//chrome/browser/profiles",
+    "//chrome/browser/profiles:profile",
     "//chrome/common:constants",
     "//components/media_router/common:common",
     "//components/prefs:prefs",

chrome/browser/media/router/media_router_feature.cc

@@ -17,6 +17,7 @@
 #include "base/strings/string_util.h"
 #include "build/build_config.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "components/media_router/common/pref_names.h"
 #include "components/prefs/pref_service.h"
@@ -31,6 +32,10 @@
 #include "components/prefs/pref_registry_simple.h"
 #endif
 
+#if BUILDFLAG(IS_CHROMEOS_ASH)
+#include "chrome/browser/profiles/profile_types_ash.h"
+#endif
+
 namespace media_router {
 
 #if BUILDFLAG(IS_ANDROID)
@@ -88,6 +93,12 @@ bool MediaRouterEnabled(content::BrowserContext* context) {
   if (!base::FeatureList::IsEnabled(kMediaRouter))
     return false;
 #endif  // !BUILDFLAG(IS_ANDROID)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
+  // TODO(crbug.com/1380828): Make the Media Router feature configurable via a
+  // policy for non-user profiles, i.e. sign-in and lock screen profiles.
+  if (!IsUserProfile(Profile::FromBrowserContext(context)))
+    return false;
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
   // The MediaRouter service is shared across the original and the incognito
   // profiles, so we must use the original context for consistency between them.