[Media Router] 2nd take on fix route response callback lifetime in UI.

chrome/browser/media/router/presentation_service_delegate_impl.h

Index: chrome/browser/media/router/presentation_service_delegate_impl.h
diff --git a/chrome/browser/media/router/presentation_service_delegate_impl.h b/chrome/browser/media/router/presentation_service_delegate_impl.h
index b7a3545fd3e967cc5635538479cc6ce2a7447e34..34e961ec27a3b37b21d2fddead7404db97c44c42 100644
--- a/chrome/browser/media/router/presentation_service_delegate_impl.h
+++ b/chrome/browser/media/router/presentation_service_delegate_impl.h
@@ -103,11 +103,11 @@ class PresentationServiceDelegateImpl
       int render_frame_id,
       const content::SessionStateChangedCallback& state_changed_cb) override;
 
-  // Callback invoked when a |route| has been created or joined outside of a
-  // Presentation API request. The route could be due to
+  // Callback invoked when there is a route response from CreateRoute/JoinRoute
+  // outside of a Presentation API request. This could be due to
   // browser action (e.g., browser initiated media router dialog) or
   // a media route provider (e.g., autojoin).
-  void OnRouteCreated(const MediaRoute& route);
+  void OnRouteResponse(const MediaRoute* route, const std::string& error);
 
   // Returns the default MediaSource for this tab if there is one.
   // Returns an empty MediaSource otherwise.
@@ -160,7 +160,7 @@ class PresentationServiceDelegateImpl
                            const content::PresentationSessionInfo& session,
                            const PresentationSessionSuccessCallback& success_cb,
                            const PresentationSessionErrorCallback& error_cb,
-                           scoped_ptr<MediaRoute> route,
+                           const MediaRoute* route,
                            const std::string& error_text);
 
   void OnStartSessionSucceeded(