move the APM to chrome.

content/renderer/media/webrtc_audio_capturer_sink_owner.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_RENDERER_MEDIA_WEBRTC_AUDIO_CAPTURER_SINK_OWNER_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_AUDIO_CAPTURER_SINK_OWNER_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "content/renderer/media/webrtc_audio_device_impl.h"
 #include "media/audio/audio_parameters.h"
 
 namespace content {
 
-class WebRtcAudioCapturerSink;
-
 // Reference counted container of WebRtcAudioCapturerSink delegates.
 class WebRtcAudioCapturerSinkOwner
     : public base::RefCountedThreadSafe<WebRtcAudioCapturerSinkOwner>,
       public WebRtcAudioCapturerSink {
  public:
   explicit WebRtcAudioCapturerSinkOwner(WebRtcAudioCapturerSink* sink);
 
   // WebRtcAudioCapturerSink implementation.
   virtual int CaptureData(const std::vector<int>& channels,
                           const int16* audio_data,
@@ skipping 28 matching lines @@
   friend class base::RefCountedThreadSafe<WebRtcAudioCapturerSinkOwner>;
   WebRtcAudioCapturerSink* delegate_;
   mutable base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRtcAudioCapturerSinkOwner);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_AUDIO_CAPTURER_SINK_OWNER_H_