Move media/audio files into media namespace

media/audio/win/waveout_output_win.h

Index: media/audio/win/waveout_output_win.h
diff --git a/media/audio/win/waveout_output_win.h b/media/audio/win/waveout_output_win.h
index e7cb4ed3101a872818df4d278e3585da1e642eb4..69642fc673df71a85b882dc749629eb8e3ea8182 100644
--- a/media/audio/win/waveout_output_win.h
+++ b/media/audio/win/waveout_output_win.h
@@ -17,6 +17,8 @@
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 
+namespace media {
+
 class AudioManagerWin;
 
 // Implements PCM audio output support for Windows using the WaveXXX API.
@@ -132,4 +134,6 @@ class PCMWaveOutAudioOutputStream : public AudioOutputStream {
   DISALLOW_COPY_AND_ASSIGN(PCMWaveOutAudioOutputStream);
 };
 
+}  // namespace media
+
 #endif  // MEDIA_AUDIO_WIN_WAVEOUT_OUTPUT_WIN_H_