Fix chromeos=1 so Pulse is preferred when use_cras=0.

media/audio/cras/cras_unified.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.
 //
 // Creates a unified stream based on the cras (ChromeOS audio server) interface.
 //
 // CrasUnifiedStream object is *not* thread-safe and should only be used
 // from the audio thread.
 
 #ifndef MEDIA_AUDIO_LINUX_CRAS_UNIFIED_H_
 #define MEDIA_AUDIO_LINUX_CRAS_UNIFIED_H_
 
-#include <alsa/asoundlib.h>
 #include <cras_client.h>
 
 #include "base/compiler_specific.h"
-#include "base/gtest_prod_util.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 
 namespace media {
 
 class AudioManagerCras;
-class AudioParameters;
 
 // Implementation of AudioOuputStream for Chrome OS using the Chrome OS audio
 // server.
 class MEDIA_EXPORT CrasUnifiedStream : public AudioOutputStream {
  public:
   // The ctor takes all the usual parameters, plus |manager| which is the
   // audio manager who is creating this object.
   CrasUnifiedStream(const AudioParameters& params, AudioManagerCras* manager);
 
   // The dtor is typically called by the AudioManager only and it is usually
@@ skipping 78 matching lines @@
 
   // Direciton of the stream.
   CRAS_STREAM_DIRECTION stream_direction_;
 
   DISALLOW_COPY_AND_ASSIGN(CrasUnifiedStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_LINUX_CRAS_UNIFIED_H_