Reverted the code for the non-interactive audible tab notification

content/browser/media/android/browser_media_player_manager.h

Index: content/browser/media/android/browser_media_player_manager.h
diff --git a/content/browser/media/android/browser_media_player_manager.h b/content/browser/media/android/browser_media_player_manager.h
index 9ec5e77fc135bd6546190e248be4f23f25a694ea..cb0ce381f8669f7a5f9ae75be661872f9672745f 100644
--- a/content/browser/media/android/browser_media_player_manager.h
+++ b/content/browser/media/android/browser_media_player_manager.h
@@ -32,7 +32,6 @@ namespace content {
 class BrowserDemuxerAndroid;
 class ContentViewCoreImpl;
 class ExternalVideoSurfaceContainer;
-class MediaPlayersObserver;
 class RenderFrameHost;
 class WebContents;
 
@@ -46,8 +45,7 @@ class CONTENT_EXPORT BrowserMediaPlayerManager
       public MediaSessionObserver {
  public:
   // Permits embedders to provide an extended version of the class.
-  typedef BrowserMediaPlayerManager* (*Factory)(RenderFrameHost*,
-                                                MediaPlayersObserver*);
+  typedef BrowserMediaPlayerManager* (*Factory)(RenderFrameHost*);
   static void RegisterFactory(Factory factory);
 
   // Permits embedders to handle custom urls.
@@ -62,9 +60,7 @@ class CONTENT_EXPORT BrowserMediaPlayerManager
                              int player_id);
 
   // Returns a new instance using the registered factory if available.
-  static BrowserMediaPlayerManager* Create(
-      RenderFrameHost* rfh,
-      MediaPlayersObserver* audio_monitor);
+  static BrowserMediaPlayerManager* Create(RenderFrameHost* rfh);
 
   ContentViewCore* GetContentViewCore() const;
 
@@ -97,8 +93,6 @@ class CONTENT_EXPORT BrowserMediaPlayerManager
                       const base::TimeDelta& current_time) override;
   void OnError(int player_id, int error) override;
   void OnVideoSizeChanged(int player_id, int width, int height) override;
-  void OnAudibleStateChanged(
-      int player_id, bool is_audible_now) override;
   void OnWaitingForDecryptionKey(int player_id) override;
 
   media::MediaResourceGetter* GetMediaResourceGetter() override;
@@ -137,8 +131,7 @@ class CONTENT_EXPORT BrowserMediaPlayerManager
 
  protected:
   // Clients must use Create() or subclass constructor.
-  BrowserMediaPlayerManager(RenderFrameHost* render_frame_host,
-                            MediaPlayersObserver* audio_monitor);
+  explicit BrowserMediaPlayerManager(RenderFrameHost* render_frame_host);
 
   WebContents* web_contents() const { return web_contents_; }
 
@@ -187,8 +180,6 @@ class CONTENT_EXPORT BrowserMediaPlayerManager
 
   RenderFrameHost* const render_frame_host_;
 
-  MediaPlayersObserver* audio_monitor_;
-
   // An array of managed players.
   ScopedVector<media::MediaPlayerAndroid> players_;