Move media/audio files into media namespace

media/audio/mac/audio_low_latency_output_mac.cc

Index: media/audio/mac/audio_low_latency_output_mac.cc
diff --git a/media/audio/mac/audio_low_latency_output_mac.cc b/media/audio/mac/audio_low_latency_output_mac.cc
index 39ebf1aa09074e9154011bfac5a9df517924cc24..b1f15dd4a83d40f3e4a7a50211a60a2e40b32711 100644
--- a/media/audio/mac/audio_low_latency_output_mac.cc
+++ b/media/audio/mac/audio_low_latency_output_mac.cc
@@ -12,6 +12,8 @@
 #include "media/audio/audio_util.h"
 #include "media/audio/mac/audio_manager_mac.h"
 
+namespace media {
+
 // Reorder PCM from AAC layout to Core Audio 5.1 layout.
 // TODO(fbarchard): Switch layout when ffmpeg is updated.
 template<class Format>
@@ -350,3 +352,5 @@ double AUAudioOutputStream::GetPlayoutLatency(
 
   return (delay_frames + hardware_latency_frames_);
 }
+
+}  // namespace media