Move media/audio files into media namespace

media/audio/audio_buffers_state.h

Index: media/audio/audio_buffers_state.h
diff --git a/media/audio/audio_buffers_state.h b/media/audio/audio_buffers_state.h
index a7299e1bf086f4778ff33918e150f2f10c5a9747..79244aeb1a51dc24d103da8a453f41708ba4bad0 100644
--- a/media/audio/audio_buffers_state.h
+++ b/media/audio/audio_buffers_state.h
@@ -7,6 +7,8 @@
 
 #include "media/base/media_export.h"
 
+namespace media {
+
 // AudioBuffersState struct stores current state of audio buffers.
 // It is used for audio synchronization.
 struct MEDIA_EXPORT AudioBuffersState {
@@ -25,4 +27,6 @@ struct MEDIA_EXPORT AudioBuffersState {
   int hardware_delay_bytes;
 };
 
+}  // namespace media
+
 #endif  // MEDIA_AUDIO_AUDIO_BUFFERS_STATE_H_