[Presentation API] Change ListenForSessionMessages API to client-style.

chrome/browser/media/android/router/media_router_android.h

Index: chrome/browser/media/android/router/media_router_android.h
diff --git a/chrome/browser/media/android/router/media_router_android.h b/chrome/browser/media/android/router/media_router_android.h
index 0697e99bfad0af2b3e19d9af56d6341576cba621..edb4655a6b61182bbdefe5b6aa3c105cf00937fb 100644
--- a/chrome/browser/media/android/router/media_router_android.h
+++ b/chrome/browser/media/android/router/media_router_android.h
@@ -35,9 +35,6 @@ class MediaRouterAndroid : public MediaRouter {
   void SendRouteMessage(const MediaRoute::Id& route_id,
                         const std::string& message,
                         const SendRouteMessageCallback& callback) override;
-  void ListenForRouteMessages(
-      const std::vector<MediaRoute::Id>& route_ids,
-      const PresentationSessionMessageCallback& message_cb) override;
   void ClearIssue(const Issue::Id& issue_id) override;
 
  private:
@@ -52,6 +49,10 @@ class MediaRouterAndroid : public MediaRouter {
   void UnregisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
   void RegisterIssuesObserver(IssuesObserver* observer) override;
   void UnregisterIssuesObserver(IssuesObserver* observer) override;
+  void RegisterPresentationSessionMessagesObserver(
+      PresentationSessionMessagesObserver* observer) override;
+  void UnregisterPresentationSessionMessagesObserver(
+      PresentationSessionMessagesObserver* observer) override;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterAndroid);
 };