Move media/audio files into media namespace

media/audio/audio_io.h

Index: media/audio/audio_io.h
diff --git a/media/audio/audio_io.h b/media/audio/audio_io.h
index f3b20ec4ea49919cd802f4b4d841d42a3920e7e3..03f11227a9aa9b41fcefa01506a9e52c38e3a137 100644
--- a/media/audio/audio_io.h
+++ b/media/audio/audio_io.h
@@ -45,6 +45,9 @@
 // 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
@@ -166,4 +169,6 @@ class MEDIA_EXPORT AudioInputStream {
   virtual double GetVolume() = 0;
 };
 
+}  // namespace media
+
 #endif  // MEDIA_AUDIO_AUDIO_IO_H_