Move media/audio files into media namespace (relanding)

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..bc53bb479d05dd38885f9980bddcf47c3fa5c5e4 100644
--- a/media/audio/win/waveout_output_win.h
+++ b/media/audio/win/waveout_output_win.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -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_