Move media/audio files into media namespace

media/audio/simple_sources.h

 // Copyright (c) 2011 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.
 
 #ifndef MEDIA_AUDIO_SIMPLE_SOURCES_H_
 #define MEDIA_AUDIO_SIMPLE_SOURCES_H_
 
 #include <list>
 
 #include "media/audio/audio_io.h"
 #include "media/base/seekable_buffer.h"
 
+namespace media {
+
 // An audio source that produces a pure sinusoidal tone.
 class MEDIA_EXPORT SineWaveAudioSource
     : public AudioOutputStream::AudioSourceCallback {
  public:
   enum Format {
     FORMAT_8BIT_LINEAR_PCM,
     FORMAT_16BIT_LINEAR_PCM,
   };
   // |channels| is the number of audio channels, |freq| is the frequency in
   // hertz and it has to be less than half of the sampling frequency
@@ skipping 58 matching lines @@
   // Discard all buffered data and reset to initial state.
   void ClearAll();
 
  private:
   // Free acquired resources.
   void CleanUp();
 
   media::SeekableBuffer buffer_;
 };
 
+}  // namespace media
+
 #endif  // MEDIA_AUDIO_SIMPLE_SOURCES_H_