Make MediaSession a runtime-enabled feature on Desktop.

content/browser/media/android/media_web_contents_observer_android.h

Index: content/browser/media/android/media_web_contents_observer_android.h
diff --git a/content/browser/media/android/media_web_contents_observer_android.h b/content/browser/media/android/media_web_contents_observer_android.h
index e8e36503f8f13655680957bdcf4fabce67237369..d54eebf49c7cd8d6ca3d38abb9580c0fc80bf2aa 100644
--- a/content/browser/media/android/media_web_contents_observer_android.h
+++ b/content/browser/media/android/media_web_contents_observer_android.h
@@ -19,7 +19,6 @@ class BrowserCdmManager;
 class BrowserMediaPlayerManager;
 class BrowserMediaSessionManager;
 class BrowserSurfaceViewManager;
-class MediaSessionController;
 
 // This class adds Android specific extensions to the MediaWebContentsObserver.
 class CONTENT_EXPORT MediaWebContentsObserverAndroid
@@ -68,21 +67,6 @@ class CONTENT_EXPORT MediaWebContentsObserverAndroid
                          RenderFrameHost* render_frame_host) override;
 
  private:
-  // Handles messages from the WebMediaPlayerDelegate; does not modify the
-  // handled state since the superclass needs to handle these as well.
-  void OnMediaPlayerDelegateMessageReceived(const IPC::Message& msg,
-                                            RenderFrameHost* render_frame_host);
-  void OnMediaDestroyed(RenderFrameHost* render_frame_host, int delegate_id);
-  void OnMediaPaused(RenderFrameHost* render_frame_host,
-                     int delegate_id,
-                     bool reached_end_of_stream);
-  void OnMediaPlaying(RenderFrameHost* render_frame_host,
-                      int delegate_id,
-                      bool has_video,
-                      bool has_audio,
-                      bool is_remote,
-                      base::TimeDelta duration);
-
   // Helper functions to handle media player IPC messages. Returns whether the
   // |message| is handled in the function.
   bool OnMediaPlayerMessageReceived(const IPC::Message& message,
@@ -111,11 +95,6 @@ class CONTENT_EXPORT MediaWebContentsObserverAndroid
                              scoped_ptr<BrowserMediaSessionManager>>;
   MediaSessionManagerMap media_session_managers_;
 
-  // Map of renderer process media players to session controllers.
-  using MediaSessionMap =
-      std::map<MediaPlayerId, scoped_ptr<MediaSessionController>>;
-  MediaSessionMap media_session_map_;
-
   using SurfaceViewManagerMap =
       base::ScopedPtrHashMap<RenderFrameHost*,
                              scoped_ptr<BrowserSurfaceViewManager>>;