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

chrome/browser/media/router/mock_media_router.h

Index: chrome/browser/media/router/mock_media_router.h
diff --git a/chrome/browser/media/router/mock_media_router.h b/chrome/browser/media/router/mock_media_router.h
index 3ee7e6b72d5ecf18302f3fd08b68de010131cc56..8de685ca67be70c66e10c482457340dd53028ae6 100644
--- a/chrome/browser/media/router/mock_media_router.h
+++ b/chrome/browser/media/router/mock_media_router.h
@@ -50,13 +50,9 @@ class MockMediaRouter : public MediaRouter {
                void(const MediaRoute::Id& route_id,
                     std::vector<uint8>* data,
                     const SendRouteMessageCallback& callback));
-  MOCK_METHOD2(ListenForRouteMessages,
-               void(const std::vector<MediaRoute::Id>& route_ids,
-                    const PresentationSessionMessageCallback& message_cb));
   MOCK_METHOD1(ClearIssue, void(const Issue::Id& issue_id));
   MOCK_METHOD1(RegisterIssuesObserver, void(IssuesObserver* observer));
   MOCK_METHOD1(UnregisterIssuesObserver, void(IssuesObserver* observer));
-
   MOCK_METHOD1(RegisterMediaSinksObserver, void(MediaSinksObserver* observer));
   MOCK_METHOD1(UnregisterMediaSinksObserver,
                void(MediaSinksObserver* observer));
@@ -64,6 +60,10 @@ class MockMediaRouter : public MediaRouter {
                void(MediaRoutesObserver* observer));
   MOCK_METHOD1(UnregisterMediaRoutesObserver,
                void(MediaRoutesObserver* observer));
+  MOCK_METHOD1(RegisterPresentationSessionMessagesObserver,
+               void(PresentationSessionMessagesObserver* observer));
+  MOCK_METHOD1(UnregisterPresentationSessionMessagesObserver,
+               void(PresentationSessionMessagesObserver* observer));
 };
 
 }  // namespace media_router