Remove VCMRenderBufferSizeCallback.

webrtc/modules/video_coding/include/video_coding_defines.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 181 matching lines @@
 class VCMQMSettingsCallback {
  public:
   virtual int32_t SetVideoQMSettings(const uint32_t frameRate,
                                      const uint32_t width,
                                      const uint32_t height) = 0;
 
  protected:
   virtual ~VCMQMSettingsCallback() {}
 };
 
-// Callback class used for telling the user about the size (in time) of the
-// render buffer, that is the size in time of the complete continuous frames.
-class VCMRenderBufferSizeCallback {
- public:
-  virtual void RenderBufferSizeMs(int buffer_size_ms) = 0;
-
- protected:
-  virtual ~VCMRenderBufferSizeCallback() {}
-};
-
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_INCLUDE_VIDEO_CODING_DEFINES_H_