MediaRecorder: make MediaRecorderHandler a MediaStreamObserver

content/renderer/media/media_stream.h

 // Copyright 2014 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_RENDERER_MEDIA_MEDIA_STREAM_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_H_
 
-#include <string>
 #include <vector>
 
-#include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 
 namespace content {
 
 // MediaStreamObserver can be used to get notifications of when a track is
 // added or removed from a MediaStream.
@@ skipping 35 matching lines @@
  private:
   base::ThreadChecker thread_checker_;
   std::vector<MediaStreamObserver*> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStream);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_H_