Delete FrameInput method and FrameInputWrapper class.

talk/app/webrtc/videosourceinterface.h

 /*
  * libjingle
  * Copyright 2012 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 37 matching lines @@
   // Stop the video capturer.
   virtual void Stop() = 0;
   virtual void Restart() = 0;
 
   // Adds |output| to the source to receive frames.
   virtual void AddSink(
       rtc::VideoSinkInterface<cricket::VideoFrame>* output) = 0;
   virtual void RemoveSink(
       rtc::VideoSinkInterface<cricket::VideoFrame>* output) = 0;
   virtual const cricket::VideoOptions* options() const = 0;
-  virtual cricket::VideoRenderer* FrameInput() = 0;
+  // TODO(nisse): Dummy implementation. Delete as soon as chrome's
+  // MockVideoSource is updated.
+  virtual cricket::VideoRenderer* FrameInput() { return nullptr; }
 
  protected:
   virtual ~VideoSourceInterface() {}
 };
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_VIDEOSOURCEINTERFACE_H_