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

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

Index: chrome/browser/media/android/router/media_router_android.cc
diff --git a/chrome/browser/media/android/router/media_router_android.cc b/chrome/browser/media/android/router/media_router_android.cc
index 688c7e28ce52b81052805516605b98b7448c1f93..9dafb489860b31fe13d74530d44d033173ac2664 100644
--- a/chrome/browser/media/android/router/media_router_android.cc
+++ b/chrome/browser/media/android/router/media_router_android.cc
@@ -39,23 +39,15 @@ void MediaRouterAndroid::SendRouteMessage(
     const SendRouteMessageCallback& callback) {
   NOTIMPLEMENTED();
 }
-
 void MediaRouterAndroid::SendRouteBinaryMessage(
     const MediaRoute::Id& route_id,
     scoped_ptr<std::vector<uint8>> data,
     const SendRouteMessageCallback& callback) {
   NOTIMPLEMENTED();
 }
-
-void MediaRouterAndroid::ListenForRouteMessages(
-    const std::vector<MediaRoute::Id>& route_ids,
-    const PresentationSessionMessageCallback& message_cb) {
-  NOTIMPLEMENTED();
-}
 void MediaRouterAndroid::ClearIssue(const Issue::Id& issue_id) {
   NOTIMPLEMENTED();
 }
-
 void MediaRouterAndroid::RegisterMediaSinksObserver(
     MediaSinksObserver* observer) {
   NOTIMPLEMENTED();
@@ -78,5 +70,13 @@ void MediaRouterAndroid::RegisterIssuesObserver(IssuesObserver* observer) {
 void MediaRouterAndroid::UnregisterIssuesObserver(IssuesObserver* observer) {
   NOTIMPLEMENTED();
 }
+void MediaRouterAndroid::RegisterPresentationSessionMessagesObserver(
+    PresentationSessionMessagesObserver* observer) {
+  NOTIMPLEMENTED();
+}
+void MediaRouterAndroid::UnregisterPresentationSessionMessagesObserver(
+    PresentationSessionMessagesObserver* observer) {
+  NOTIMPLEMENTED();
+}
 
 }  // namespace media_router