Renamed VideoSourceInterface to VideoTrackSourceInterface.

talk/app/webrtc/objc/RTCVideoSource.mm

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 19 matching lines @@
 #endif
 
 #import "RTCMediaSource+Internal.h"
 #import "RTCVideoSource+Internal.h"
 
 @implementation RTCVideoSource
 @end
 
 @implementation RTCVideoSource (Internal)
 
-- (rtc::scoped_refptr<webrtc::VideoSourceInterface>)videoSource {
-  return static_cast<webrtc::VideoSourceInterface*>(self.mediaSource.get());
+- (rtc::scoped_refptr<webrtc::VideoTrackSourceInterface>)videoSource {
+  return static_cast<webrtc::VideoTrackSourceInterface *>(self.mediaSource.get());
 }
 
 @end