Migrating MediaSession messages to mojo

content/browser/media/android/media_web_contents_observer_android.h

 // Copyright 2016 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.
 
 #ifndef CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_ANDROID_H_
 #define CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_ANDROID_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 67 matching lines @@
 
  private:
   // Helper functions to handle media player IPC messages. Returns whether the
   // |message| is handled in the function.
   bool OnMediaPlayerMessageReceived(const IPC::Message& message,
                                     RenderFrameHost* render_frame_host);
 
   bool OnMediaPlayerSetCdmMessageReceived(const IPC::Message& message,
                                           RenderFrameHost* render_frame_host);
 
-  bool OnMediaSessionMessageReceived(const IPC::Message& message,
-                                     RenderFrameHost* render_frame_host);
-
   bool OnSurfaceViewManagerMessageReceived(const IPC::Message& message,
                                      RenderFrameHost* render_frame_host);
 
   void OnSetCdm(RenderFrameHost* render_frame_host, int player_id, int cdm_id);
 
   // Map from RenderFrameHost* to BrowserMediaPlayerManager.
   using MediaPlayerManagerMap =
       base::ScopedPtrHashMap<RenderFrameHost*,
                              std::unique_ptr<BrowserMediaPlayerManager>>;
   MediaPlayerManagerMap media_player_managers_;
 
-  // Map from RenderFrameHost* to BrowserMediaSessionManager.
   using MediaSessionManagerMap =

[mlamouri (slow - plz ping), 2016/09/27 08:33:11]

How much of this can be removed?

       base::ScopedPtrHashMap<RenderFrameHost*,
                              std::unique_ptr<BrowserMediaSessionManager>>;
   MediaSessionManagerMap media_session_managers_;
 
   using SurfaceViewManagerMap =
       base::ScopedPtrHashMap<RenderFrameHost*,
                              std::unique_ptr<BrowserSurfaceViewManager>>;
   SurfaceViewManagerMap surface_view_managers_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserverAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_ANDROID_H_