Pass origin to StartObservingMediaSinks.

chrome/test/media_router/test_media_sinks_observer.h

Index: chrome/test/media_router/test_media_sinks_observer.h
diff --git a/chrome/test/media_router/test_media_sinks_observer.h b/chrome/test/media_router/test_media_sinks_observer.h
index d4607d879fa5e87847d9e2ee48e369023747b367..93b7812a9607613257ac6e6d8627710b2ee089d3 100644
--- a/chrome/test/media_router/test_media_sinks_observer.h
+++ b/chrome/test/media_router/test_media_sinks_observer.h
@@ -19,11 +19,13 @@ class MediaRouter;
 // from Media Router and is used for verification.
 class TestMediaSinksObserver : public MediaSinksObserver {
  public:
-  TestMediaSinksObserver(MediaRouter* router, const MediaSource& source);
+  TestMediaSinksObserver(MediaRouter* router,
+                         const MediaSource& source);
   ~TestMediaSinksObserver() override;
 
   // MediaSinksObserver implementation.
-  void OnSinksReceived(const std::vector<MediaSink>& result) override;
+  void OnSinksReceived(const MediaSource& source,
+                       const std::vector<MediaSink>& result) override;
 
   // Map of <sink_name, media_sink_object>
   std::map<std::string, const MediaSink> sink_map;