Update MediaStreamTrack::Stop to latest draft.

content/renderer/media/mock_media_stream_dependency_factory.cc

Index: content/renderer/media/mock_media_stream_dependency_factory.cc
diff --git a/content/renderer/media/mock_media_stream_dependency_factory.cc b/content/renderer/media/mock_media_stream_dependency_factory.cc
index d07cb3a23fc6b87f78e8ce1ddd68b14917ba053a..5dcd31118c07ecd4292ada6d37aae250af42f25e 100644
--- a/content/renderer/media/mock_media_stream_dependency_factory.cc
+++ b/content/renderer/media/mock_media_stream_dependency_factory.cc
@@ -11,6 +11,7 @@
 #include "content/renderer/media/webrtc/webrtc_local_audio_track_adapter.h"
 #include "content/renderer/media/webrtc/webrtc_video_capturer_adapter.h"
 #include "content/renderer/media/webrtc_audio_capturer.h"
+#include "content/renderer/media/webrtc_local_audio_track.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
 #include "third_party/libjingle/source/talk/base/scoped_ref_ptr.h"
@@ -520,14 +521,16 @@ MockMediaStreamDependencyFactory::CreateIceCandidate(
 scoped_refptr<WebRtcAudioCapturer>
 MockMediaStreamDependencyFactory::CreateAudioCapturer(
     int render_view_id, const StreamDeviceInfo& device_info,
-    const blink::WebMediaConstraints& constraints) {
+    const blink::WebMediaConstraints& constraints,
+    MediaStreamAudioSource* audio_source) {
+  DCHECK(audio_source);
   return WebRtcAudioCapturer::CreateCapturer(-1, device_info,
-                                             constraints, NULL);
+                                             constraints, NULL, audio_source);
 }
 
 void MockMediaStreamDependencyFactory::StartLocalAudioTrack(
       WebRtcLocalAudioTrack* audio_track) {
-  return;
+  audio_track->Start();
 }
 
 }  // namespace content