Move media/audio files into media namespace

media/audio/audio_buffers_state.cc

Index: media/audio/audio_buffers_state.cc
diff --git a/media/audio/audio_buffers_state.cc b/media/audio/audio_buffers_state.cc
index 7e829fe0fc8db5194dd3de9dd2779ab339f39205..6c4f9501605bb065625da0a489be255704ce237d 100644
--- a/media/audio/audio_buffers_state.cc
+++ b/media/audio/audio_buffers_state.cc
@@ -4,6 +4,8 @@
 
 #include "media/audio/audio_buffers_state.h"
 
+namespace media {
+
 AudioBuffersState::AudioBuffersState()
     : pending_bytes(0),
       hardware_delay_bytes(0) {
@@ -14,3 +16,5 @@ AudioBuffersState::AudioBuffersState(int pending_bytes,
     : pending_bytes(pending_bytes),
       hardware_delay_bytes(hardware_delay_bytes) {
 }
+
+}  // namespace media