Move media/audio files into media namespace

media/audio/win/audio_manager_win.cc

Index: media/audio/win/audio_manager_win.cc
diff --git a/media/audio/win/audio_manager_win.cc b/media/audio/win/audio_manager_win.cc
index 1d19fe113c4779316221627e69734fbe786ef942..93dcf2f32c3c58246424ff521b3d4d67386a1857 100644
--- a/media/audio/win/audio_manager_win.cc
+++ b/media/audio/win/audio_manager_win.cc
@@ -38,6 +38,8 @@
 DEFINE_GUID(AM_KSCATEGORY_AUDIO, 0x6994ad04, 0x93ef, 0x11d0,
             0xa3, 0xcc, 0x00, 0xa0, 0xc9, 0x22, 0x31, 0x96);
 
+namespace media {
+
 // Maximum number of output streams that can be open simultaneously.
 static const int kMaxOutputStreams = 50;
 
@@ -317,3 +319,5 @@ AudioInputStream* AudioManagerWin::CreatePCMWaveInAudioInputStream(
 AudioManager* CreateAudioManager() {
   return new AudioManagerWin();
 }
+
+}  // namespace media