Move media/audio files into media namespace

media/audio/audio_manager_base.cc

Index: media/audio/audio_manager_base.cc
diff --git a/media/audio/audio_manager_base.cc b/media/audio/audio_manager_base.cc
index 89191af5f8c574dd8fa2b64b0617f4450cd9f840..45bf0fc1c586da062fab0ed02f371c94f77275ff 100644
--- a/media/audio/audio_manager_base.cc
+++ b/media/audio/audio_manager_base.cc
@@ -12,6 +12,8 @@
 #include "media/audio/fake_audio_input_stream.h"
 #include "media/audio/fake_audio_output_stream.h"
 
+namespace media {
+
 static const int kStreamCloseDelaySeconds = 5;
 
 // Default maximum number of output streams that can be open simultaneously
@@ -226,3 +228,5 @@ void AudioManagerBase::ShutdownOnAudioThread() {
 
   output_dispatchers_.clear();
 }
+
+}  // namespace media