Delete FrameInput method and FrameInputWrapper class.

talk/app/webrtc/videosource.h

Index: talk/app/webrtc/videosource.h
diff --git a/talk/app/webrtc/videosource.h b/talk/app/webrtc/videosource.h
index eaaec41962ed7d7ecf2f296262d11b79ffd891c8..9bd8c217f322d55d984682a847f30ef9ba95fca6 100644
--- a/talk/app/webrtc/videosource.h
+++ b/talk/app/webrtc/videosource.h
@@ -74,7 +74,9 @@ class VideoSource : public Notifier<VideoSourceInterface>,
   bool remote() const override { return remote_; }
 
   virtual const cricket::VideoOptions* options() const { return &options_; }
-  virtual cricket::VideoRenderer* FrameInput();
+  // TODO(nisse): Dummy implementation. Delete as soon as chrome's
+  // MockVideoSource is updated.
+  virtual cricket::VideoRenderer* FrameInput() { return nullptr; }
 
   virtual cricket::VideoCapturer* GetVideoCapturer() {
     return video_capturer_.get();