Cleanup: Remove unneeded forward declarations in base, dbug, gpu, ipc, jingle, and media.

media/audio/mac/audio_manager_mac.h

 // Copyright (c) 2011 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 MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
 #define MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "media/audio/audio_manager_base.h"
 
-class PCMQueueInAudioInputStream;
-class PCMQueueOutAudioOutputStream;
-
 // Mac OS X implementation of the AudioManager singleton. This class is internal
 // to the audio output and only internal users can call methods not exposed by
 // the AudioManager class.
 class AudioManagerMac : public AudioManagerBase {
  public:
   AudioManagerMac();
 
   // Implementation of AudioManager.
   virtual bool HasAudioOutputDevices() OVERRIDE;
   virtual bool HasAudioInputDevices() OVERRIDE;
@@ skipping 15 matching lines @@
  private:
   virtual ~AudioManagerMac();
 
   // Number of currently open output streams.
   size_t num_output_streams_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioManagerMac);
 };
 
 #endif  // MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_