Reverted the code for the non-interactive audible tab notification

content/content_browser.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../components/url_formatter/url_formatter.gyp:url_formatter',
     '../crypto/crypto.gyp:crypto',
     '../device/battery/battery.gyp:device_battery',
@@ skipping 382 matching lines @@
       'browser/android/in_process/synchronous_compositor_registry.cc',
       'browser/android/in_process/synchronous_compositor_registry.h',
       'browser/android/in_process/synchronous_input_event_filter.cc',
       'browser/android/in_process/synchronous_input_event_filter.h',
       'browser/android/in_process_surface_texture_manager.cc',
       'browser/android/in_process_surface_texture_manager.h',
       'browser/android/interstitial_page_delegate_android.cc',
       'browser/android/interstitial_page_delegate_android.h',
       'browser/android/load_url_params.cc',
       'browser/android/load_url_params.h',
-      'browser/android/media_players_observer.cc',
-      'browser/android/media_players_observer.h',
       'browser/android/overscroll_controller_android.cc',
       'browser/android/overscroll_controller_android.h',
       'browser/android/overscroll_glow.cc',
       'browser/android/overscroll_glow.h',
       'browser/android/overscroll_refresh.cc',
       'browser/android/overscroll_refresh.h',
       'browser/android/popup_touch_handle_drawable.cc',
       'browser/android/popup_touch_handle_drawable.h',
       'browser/android/tracing_controller_android.cc',
       'browser/android/tracing_controller_android.h',
@@ skipping 601 matching lines @@
       'browser/media/android/browser_demuxer_android.h',
       'browser/media/android/browser_media_player_manager.cc',
       'browser/media/android/browser_media_player_manager.h',
       'browser/media/android/media_drm_credential_manager.cc',
       'browser/media/android/media_drm_credential_manager.h',
       'browser/media/android/media_resource_getter_impl.cc',
       'browser/media/android/media_resource_getter_impl.h',
       'browser/media/android/media_session.cc',
       'browser/media/android/media_session.h',
       'browser/media/android/media_session_observer.h',
-      'browser/media/audio_state_provider.cc',
-      'browser/media/audio_state_provider.h',
       'browser/media/audio_stream_monitor.cc',
       'browser/media/audio_stream_monitor.h',
       'browser/media/capture/audio_mirroring_manager.cc',
       'browser/media/capture/audio_mirroring_manager.h',
       'browser/media/capture/web_contents_audio_input_stream.cc',
       'browser/media/capture/web_contents_audio_input_stream.h',
       'browser/media/capture/web_contents_audio_muter.cc',
       'browser/media/capture/web_contents_audio_muter.h',
       'browser/media/capture/web_contents_capture_util.cc',
       'browser/media/capture/web_contents_capture_util.h',
@@ skipping 1118 matching lines @@
     ['enable_webvr==1 and OS=="android"', {
       'sources': [
         'browser/vr/android/cardboard/cardboard_vr_device.cc',
         'browser/vr/android/cardboard/cardboard_vr_device.h',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.cc',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.h',
       ],
     }],
   ],
 }