Revert "Add a Linux Shell that uses GTK for rendering. (#16977)"

This reverts commit c93b67a.

Author: liyuqian

ci/licenses_golden/licenses_flutter

@@ -1145,11 +1145,6 @@ FILE: ../../../flutter/shell/platform/glfw/platform_handler.h
 FILE: ../../../flutter/shell/platform/glfw/public/flutter_glfw.h
 FILE: ../../../flutter/shell/platform/glfw/text_input_plugin.cc
 FILE: ../../../flutter/shell/platform/glfw/text_input_plugin.h
-FILE: ../../../flutter/shell/platform/linux/fl_dart_project.cc
-FILE: ../../../flutter/shell/platform/linux/fl_view.cc
-FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_dart_project.h
-FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_view.h
-FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/flutter_linux.h
 FILE: ../../../flutter/shell/platform/windows/angle_surface_manager.cc
 FILE: ../../../flutter/shell/platform/windows/angle_surface_manager.h
 FILE: ../../../flutter/shell/platform/windows/client_wrapper/dart_project_unittests.cc

shell/platform/linux/BUILD.gn

@@ -5,23 +5,15 @@
 assert(is_linux)
 
 import("//flutter/shell/platform/glfw/config.gni")
-import("//flutter/shell/platform/linux/config.gni")
 
 group("linux") {
-  deps = []
   if (build_glfw_shell) {
-    deps += [
+    deps = [
       ":flutter_linux_glfw",
       "//flutter/shell/platform/glfw:publish_headers_glfw",
       "//flutter/shell/platform/glfw/client_wrapper:publish_wrapper_glfw",
     ]
   }
-  if (build_linux_shell) {
-    deps += [
-      ":flutter_linux_gtk",
-      ":publish_headers_linux",
-    ]
-  }
 }
 
 # Temporary workaround for the issue describe in
@@ -45,49 +37,3 @@ if (build_glfw_shell) {
     public_configs = [ "//flutter:config" ]
   }
 }
-
-if (build_linux_shell) {
-  _public_headers = [
-    "public/flutter_linux/fl_dart_project.h",
-    "public/flutter_linux/fl_view.h",
-    "public/flutter_linux/flutter_linux.h",
-  ]
-
-  config("relative_flutter_linux_headers") {
-    include_dirs = [ "public" ]
-  }
-
-  source_set("flutter_linux") {
-    sources = [
-      "fl_dart_project.cc",
-      "fl_view.cc",
-    ]
-
-    configs += [
-      "//flutter/shell/platform/linux/config:gtk",
-      "//flutter/shell/platform/linux/config:egl",
-    ]
-
-    # Set flag to stop headers being directly included (library users should not do this)
-    defines = [ "FLUTTER_LINUX_COMPILATION" ]
-
-    deps = [
-      "//flutter/shell/platform/embedder:embedder_with_symbol_prefix",
-    ]
-  }
-
-  shared_library("flutter_linux_gtk") {
-    deps = [
-      ":flutter_linux",
-    ]
-
-    public_configs = [ "//flutter:config" ]
-  }
-
-  copy("publish_headers_linux") {
-    sources = _public_headers
-    outputs = [
-      "$root_out_dir/flutter_linux/{{source_file_part}}",
-    ]
-  }
-}

shell/platform/linux/config.gni

@@ -3,17 +3,7 @@
 # found in the LICENSE file.
 
 import("//build/config/linux/pkg_config.gni")
-import("//flutter/shell/platform/linux/config.gni")
 
 pkg_config("x11") {
   packages = [ "x11" ]
 }
-
-if (build_linux_shell) {
-  pkg_config("gtk") {
-    packages = [ "gtk+-3.0" ]
-  }
-  pkg_config("egl") {
-    packages = [ "egl" ]
-  }
-}