Move media/audio files into media namespace

media/audio/audio_output_dispatcher.h

Index: media/audio/audio_output_dispatcher.h
diff --git a/media/audio/audio_output_dispatcher.h b/media/audio/audio_output_dispatcher.h
index cf01a31b0a74a38e9cefc0e0456c1139e38e75f3..79474a4cff318ebcda0a29f247313026ed522a58 100644
--- a/media/audio/audio_output_dispatcher.h
+++ b/media/audio/audio_output_dispatcher.h
@@ -32,9 +32,12 @@
 #include "media/audio/audio_manager.h"
 #include "media/audio/audio_parameters.h"
 
-class AudioOutputStream;
 class MessageLoop;
 
+namespace media {
+
+class AudioOutputStream;
+
 class MEDIA_EXPORT AudioOutputDispatcher
     : public base::RefCountedThreadSafe<AudioOutputDispatcher> {
  public:
@@ -107,4 +110,6 @@ class MEDIA_EXPORT AudioOutputDispatcher
   DISALLOW_COPY_AND_ASSIGN(AudioOutputDispatcher);
 };
 
+}  // namespace media
+
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_H_