Revert 130180 - Move media/audio files into media namespace

media/audio/audio_io.h

Index: media/audio/audio_io.h
===================================================================
--- media/audio/audio_io.h	(revision 130181)
+++ media/audio/audio_io.h	(working copy)
@@ -45,9 +45,6 @@
 // as the data is written to the audio device. Size of each packet is determined
 // by |samples_per_packet| specified in AudioParameters  when the stream is
 // created.
-
-namespace media {
-
 class MEDIA_EXPORT AudioOutputStream {
  public:
   // Audio sources must implement AudioSourceCallback. This interface will be
@@ -176,6 +173,4 @@
   virtual bool GetAutomaticGainControl() = 0;
 };
 
-}  // namespace media
-
 #endif  // MEDIA_AUDIO_AUDIO_IO_H_