Move media/audio files into media namespace

media/audio/audio_input_stream_impl.cc

 // Copyright (c) 2012 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 "base/logging.h"
 #include "media/audio/audio_input_stream_impl.h"
 
+namespace media {
+
 static const int kMinIntervalBetweenVolumeUpdatesMs = 1000;
 
 AudioInputStreamImpl::AudioInputStreamImpl()
     : agc_is_enabled_(false),
       max_volume_(0.0),
       normalized_volume_(0.0) {
 }
 
 AudioInputStreamImpl::~AudioInputStreamImpl() {}
 
@@ skipping 41 matching lines @@
     max_volume_ = GetMaxVolume();
   }
 
   if (max_volume_ != 0.0) {
     // Retrieve the current volume level by asking the audio hardware.
     // Range is normalized to [0.0,1.0] or [0.0, 1.5] on Linux.
     normalized_volume_ = GetVolume() / max_volume_;
   }
 }
 
+}  // namespace media