Revert of Letting Flash join MediaSession (stack implementaion)

content/browser/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 
 source_set("browser") {
@@ skipping 1708 matching lines @@
       "screen_orientation/screen_orientation_message_filter_android.cc",
       "screen_orientation/screen_orientation_message_filter_android.h",
       "web_contents/web_contents_android.cc",
       "web_contents/web_contents_android.h",
       "web_contents/web_contents_view_android.cc",
       "web_contents/web_contents_view_android.h",
     ]
     sources -= [
       "browser_ipc_logging.cc",
       "device_sensors/data_fetcher_shared_memory_default.cc",
-      "media/session/audio_focus_manager.cc",
-      "media/session/audio_focus_manager.h",
       "media/session/media_session_delegate_default.cc",
       "power_usage_monitor_impl.cc",
       "power_usage_monitor_impl.h",
       "tracing/tracing_ui.cc",
       "tracing/tracing_ui.h",
 
       # Android skips most, but not all, of the speech code.
       "speech/audio_buffer.cc",
       "speech/audio_buffer.h",
       "speech/audio_encoder.cc",
@@ skipping 217 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }