Delete backwards compatibility cruft from cricket::VideoFrame and VideoSourceInterface.

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 31 matching lines @@
  public:
   // Get access to the source implementation of cricket::VideoCapturer.
   // This can be used for receiving frames and state notifications.
   // But it should not be used for starting or stopping capturing.
   virtual cricket::VideoCapturer* GetVideoCapturer() = 0;
 
   // Stop the video capturer.
   virtual void Stop() = 0;
   virtual void Restart() = 0;
 
-  // TODO(nisse): Delete these backwards compatibility wrappers after
-  // chrome is updated. Needed now because chrome's MockVideoSource
-  // defines a method with this signature (and marked with override).
-  // In addition, we need a dummy default implementation for the new
-  // AddSink/RemoveSink methods below, because they're unimplemented
-  // in the same class. This is ugly, but for MockVideoSource it
-  // doesn't really matter what these methods do, because they're not
-  // used.
-  virtual void AddSink(cricket::VideoRenderer* output) {
-    AddSink(static_cast<rtc::VideoSinkInterface<cricket::VideoFrame>*>(output));
-  }
-  virtual void RemoveSink(cricket::VideoRenderer* output) {
-    RemoveSink(
-        static_cast<rtc::VideoSinkInterface<cricket::VideoFrame>*>(output));
-  }
-
   // Adds |output| to the source to receive frames.
-  // TODO(nisse): Delete dummy default implementation.
-  virtual void AddSink(rtc::VideoSinkInterface<cricket::VideoFrame>* output){};
+  virtual void AddSink(
+      rtc::VideoSinkInterface<cricket::VideoFrame>* output) = 0;
   virtual void RemoveSink(
-      rtc::VideoSinkInterface<cricket::VideoFrame>* output){};
+      rtc::VideoSinkInterface<cricket::VideoFrame>* output) = 0;
   virtual const cricket::VideoOptions* options() const = 0;
   virtual cricket::VideoRenderer* FrameInput() = 0;
 
  protected:
   virtual ~VideoSourceInterface() {}
 };
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_VIDEOSOURCEINTERFACE_H_