Move media/audio files into media namespace

media/audio/win/waveout_output_win.cc

Index: media/audio/win/waveout_output_win.cc
diff --git a/media/audio/win/waveout_output_win.cc b/media/audio/win/waveout_output_win.cc
index c8c7523f0a5d0de0093328f3a9d914e8473bd1b7..3cae68ce5b5f4d374a72205cb86d652da73b36da 100644
--- a/media/audio/win/waveout_output_win.cc
+++ b/media/audio/win/waveout_output_win.cc
@@ -15,6 +15,8 @@
 #include "media/audio/audio_util.h"
 #include "media/audio/win/audio_manager_win.h"
 
+namespace media {
+
 // Some general thoughts about the waveOut API which is badly documented :
 // - We use CALLBACK_EVENT mode in which XP signals events such as buffer
 //   releases.
@@ -411,3 +413,5 @@ void NTAPI PCMWaveOutAudioOutputStream::BufferCallback(PVOID lpParameter,
     }
   }
 }
+
+}  // namespace media