Move media/audio files into media namespace

media/audio/android/audio_track_output_stub_android.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/android/audio_track_output_android.h"
 
+namespace media {
+
 // This file was added because there is no Java environment in
 // upstream yet, audio_track_output_android.cc should be used in
 // downstream.
 // TODO(michaelbai): Remove this file once Java environment ready.
 
 // static
 AudioOutputStream* AudioTrackOutputStream::MakeStream(
     const AudioParameters& params) {
   return NULL;
 }
+
+}  // namespace media