Move media/audio files into media namespace (relanding)

media/audio/android/audio_manager_android.cc

Index: media/audio/android/audio_manager_android.cc
diff --git a/media/audio/android/audio_manager_android.cc b/media/audio/android/audio_manager_android.cc
index 04a056485bd1c638998f8a64f3b176b29e1e6787..9feb5c7591a7273a51b8a2a87dd63f9943127b6b 100644
--- a/media/audio/android/audio_manager_android.cc
+++ b/media/audio/android/audio_manager_android.cc
@@ -11,6 +11,8 @@
 #include "media/audio/audio_manager.h"
 #include "media/audio/fake_audio_input_stream.h"
 
+namespace media {
+
 // Maximum number of output streams that can be open simultaneously.
 static const int kMaxOutputStreams = 10;
 
@@ -65,3 +67,5 @@ AudioInputStream* AudioManagerAndroid::MakeLowLatencyInputStream(
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
   return new OpenSLESInputStream(this, params);
 }
+
+}  // namespace media