Move media/audio files into media namespace

media/audio/mac/audio_low_latency_input_mac.cc

Index: media/audio/mac/audio_low_latency_input_mac.cc
diff --git a/media/audio/mac/audio_low_latency_input_mac.cc b/media/audio/mac/audio_low_latency_input_mac.cc
index ddd12edb49616d6a5f598a4b57723598dd8b9c72..aefebefe972383c1a9632ec9132529bf1383cb14 100644
--- a/media/audio/mac/audio_low_latency_input_mac.cc
+++ b/media/audio/mac/audio_low_latency_input_mac.cc
@@ -12,6 +12,8 @@
 #include "media/audio/audio_util.h"
 #include "media/audio/mac/audio_manager_mac.h"
 
+namespace media {
+
 static std::ostream& operator<<(std::ostream& os,
                                 const AudioStreamBasicDescription& format) {
   os << "sample rate       : " << format.mSampleRate << std::endl
@@ -582,3 +584,5 @@ bool AUAudioInputStream::IsVolumeSettableOnChannel(int channel) {
                                                   &is_settable);
   return (result == noErr) ? is_settable : false;
 }
+
+}  // namespace media