MediaStreamVideo*/VideoTrackAdapter and RTCVideoRenderer (small) cleanup

content/public/renderer/media_stream_video_sink.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_VIDEO_SINK_H_
 #define CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_VIDEO_SINK_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "content/public/renderer/media_stream_sink.h"
 #include "media/base/video_capturer_source.h"
 
-namespace media {
-class VideoCaptureFormat;
-class VideoFrame;
-}
-
 namespace blink {
 class WebMediaStreamTrack;
 }
 
 namespace content {
 
 typedef media::VideoCapturerSource::VideoCaptureDeliverFrameCB
     VideoCaptureDeliverFrameCB;
 
 // MediaStreamVideoSink is an interface used for receiving video frames from a
@@ skipping 19 matching lines @@
                                    const blink::WebMediaStreamTrack& track);
 
  protected:
   ~MediaStreamVideoSink() override {}
 };
 
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_VIDEO_SINK_H_