Make audio build on the Mac OS X 10.7

audio/mac/audio_output_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.
 
 #ifndef MEDIA_AUDIO_MAC_AUDIO_OUTPUT_MAC_H_
 #define MEDIA_AUDIO_MAC_AUDIO_OUTPUT_MAC_H_
 
 #include <AudioToolbox/AudioFormat.h>
 #include <AudioToolbox/AudioQueue.h>
 #include <AudioUnit/AudioUnit.h>
+#include <CoreAudio/CoreAudio.h>
 
 #include "base/compiler_specific.h"
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 
 namespace media {
 
 class AudioManagerMac;
@@ skipping 82 matching lines @@
   // When stopping we keep track of number of buffers in flight and
   // signal "stop completed" from the last buffer's callback.
   int num_buffers_left_;
 
   DISALLOW_COPY_AND_ASSIGN(PCMQueueOutAudioOutputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_MAC_AUDIO_OUTPUT_MAC_H_