Update MediaStreamTrack::Stop to latest draft.

content/renderer/media/media_stream_video_track.cc

Index: content/renderer/media/media_stream_video_track.cc
diff --git a/content/renderer/media/media_stream_video_track.cc b/content/renderer/media/media_stream_video_track.cc
index 8d4b83d6b43ff3f9d51a8860c7413b64baf8f230..3935e7bdbac58a47694e27a9d040ce562b26c38d 100644
--- a/content/renderer/media/media_stream_video_track.cc
+++ b/content/renderer/media/media_stream_video_track.cc
@@ -46,7 +46,7 @@ MediaStreamVideoTrack::MediaStreamVideoTrack(
 
 MediaStreamVideoTrack::~MediaStreamVideoTrack() {
   DCHECK(sinks_.empty());
-  source_->RemoveTrack(this);
+  Stop();
 }
 
 void MediaStreamVideoTrack::AddSink(MediaStreamVideoSink* sink) {
@@ -88,6 +88,15 @@ void MediaStreamVideoTrack::SetEnabled(bool enabled) {
   }
 }
 
+void MediaStreamVideoTrack::Stop() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  if (source_) {
+    source_->RemoveTrack(this);
+    source_ = NULL;
+  }
+  OnReadyStateChanged(blink::WebMediaStreamSource::ReadyStateEnded);
+}
+
 void MediaStreamVideoTrack::OnVideoFrame(
     const scoped_refptr<media::VideoFrame>& frame) {
   DCHECK(thread_checker_.CalledOnValidThread());