MediaVideoStreamTrack should store weak reference to the media source. Since MediaVideoStreamSource…

content/renderer/media/media_stream_video_track.h

Index: content/renderer/media/media_stream_video_track.h
diff --git a/content/renderer/media/media_stream_video_track.h b/content/renderer/media/media_stream_video_track.h
index 9769d3bb7f13f3749fa11f354917da9596a7dbc4..3184e3c2de6e2093e1fc3249b0ee64683a9b5e9b 100644
--- a/content/renderer/media/media_stream_video_track.h
+++ b/content/renderer/media/media_stream_video_track.h
@@ -84,10 +84,8 @@ class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
 
   const blink::WebMediaConstraints constraints_;
 
-  // Weak ref to the source this tracks is connected to.  |source_| is owned
-  // by the blink::WebMediaStreamSource and is guaranteed to outlive the
-  // track.
-  MediaStreamVideoSource* source_;
+  // Weak ref to the source this tracks is connected to.
+  base::WeakPtr<MediaStreamVideoSource> source_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrack);
 };