media: Cleanup class/struct forward declarations

media/audio/mac/audio_low_latency_input_mac.h

 // Copyright (c) 2012 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.
 //
 // Implementation of AudioInputStream for Mac OS X using the special AUHAL
 // input Audio Unit present in OS 10.4 and later.
 // The AUHAL input Audio Unit is for low-latency audio I/O.
 //
 // Overview of operation:
 //
@@ skipping 40 matching lines @@
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "media/audio/agc_audio_stream.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_manager.h"
 #include "media/base/audio_block_fifo.h"
 #include "media/base/audio_parameters.h"
 
 namespace media {
 
-class AudioBus;
 class AudioManagerMac;
-class DataBuffer;
 
 class MEDIA_EXPORT AUAudioInputStream
     : public AgcAudioStream<AudioInputStream> {
  public:
   // The ctor takes all the usual parameters, plus |manager| which is the
   // the audio manager who is creating this object.
   AUAudioInputStream(AudioManagerMac* manager,
                      const AudioParameters& input_params,
                      AudioDeviceID audio_device_id,
                      const AudioManager::LogCallback& log_callback);
@@ skipping 259 matching lines @@
   // this object is destroyed.
   // Note that, all member variables should appear before the WeakPtrFactory.
   base::WeakPtrFactory<AUAudioInputStream> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AUAudioInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_INPUT_MAC_H_