make pulseaudio available for all posix platforms because it's not linux only

media/audio/openbsd/audio_manager_openbsd.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_OPENBSD_AUDIO_MANAGER_OPENBSD_H_
 #define MEDIA_AUDIO_OPENBSD_AUDIO_MANAGER_OPENBSD_H_
 
-#include "base/basictypes.h"
+#include <set>
+
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/threading/thread.h"
 #include "media/audio/audio_manager_base.h"
 
 class AudioManagerOpenBSD : public AudioManagerBase {
  public:
   AudioManagerOpenBSD();
 
   // Implementation of AudioManager.
   virtual bool HasAudioOutputDevices() OVERRIDE;
   virtual bool HasAudioInputDevices() OVERRIDE;
   virtual AudioOutputStream* MakeAudioOutputStream(
       const AudioParameters& params) OVERRIDE;
   virtual AudioInputStream* MakeAudioInputStream(
       const AudioParameters& params) OVERRIDE;
   virtual bool IsRecordingInProgress() OVERRIDE;
   virtual void MuteAll() OVERRIDE;
   virtual void UnMuteAll() OVERRIDE;
 
+  virtual void ReleaseOutputStream(AudioOutputStream* stream);
+
  private:
   virtual ~AudioManagerOpenBSD();
 
+  std::set<AudioOutputStream*> active_streams_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioManagerOpenBSD);
 };
 
 #endif  // MEDIA_AUDIO_OPENBSD_AUDIO_MANAGER_OPENBSD_H_