Migrating MediaSession messages to mojo

content/browser/media/android/browser_media_session_manager.h

Index: content/browser/media/android/browser_media_session_manager.h
diff --git a/content/browser/media/android/browser_media_session_manager.h b/content/browser/media/android/browser_media_session_manager.h
index 45e6c7e0eab9bede232370e3c648af8010f3ccbe..2ba45b1d3a3de1ff1698ccb4b45837ab685ceec9 100644
--- a/content/browser/media/android/browser_media_session_manager.h
+++ b/content/browser/media/android/browser_media_session_manager.h
@@ -22,16 +22,9 @@ class CONTENT_EXPORT BrowserMediaSessionManager {
  public:
   explicit BrowserMediaSessionManager(RenderFrameHost* render_frame_host);
 
-  // Message handlers.
-  virtual void OnActivate(int session_id, int request_id);
-  virtual void OnDeactivate(int session_id, int request_id);
-  virtual void OnSetMetadata(
+  void OnSetMetadata(
       int session_id, const base::Optional<MediaMetadata>& metadata);
 
-  int GetRoutingID() const;
-
-  bool Send(IPC::Message* msg);
-
  private:
   RenderFrameHost* const render_frame_host_;