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

media/audio/openbsd/audio_manager_openbsd.h

Index: media/audio/openbsd/audio_manager_openbsd.h
diff --git a/media/audio/openbsd/audio_manager_openbsd.h b/media/audio/openbsd/audio_manager_openbsd.h
index b9f19c6e85f9cab0fcc4ab3f0565d94c93659dc2..240e973f5b913a427c7006b76df1fdea48787da8 100644
--- a/media/audio/openbsd/audio_manager_openbsd.h
+++ b/media/audio/openbsd/audio_manager_openbsd.h
@@ -5,7 +5,11 @@
 #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 {
@@ -23,9 +27,13 @@ class AudioManagerOpenBSD : public AudioManagerBase {
   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);
 };