Move media/audio files into media namespace (relanding)

media/audio/pulse/pulse_output.cc

Index: media/audio/pulse/pulse_output.cc
diff --git a/media/audio/pulse/pulse_output.cc b/media/audio/pulse/pulse_output.cc
index c58d5bfe69724ac91eed8f9e05e5e29d619574a5..651d1f73edb371a23a58a2d8d2151af5f4c49030 100644
--- a/media/audio/pulse/pulse_output.cc
+++ b/media/audio/pulse/pulse_output.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -16,6 +16,8 @@
 #include "media/base/data_buffer.h"
 #include "media/base/seekable_buffer.h"
 
+namespace media {
+
 static pa_sample_format_t BitsToPASampleFormat(int bits_per_sample) {
   switch (bits_per_sample) {
     // Unsupported sample formats shown for reference.  I am assuming we want
@@ -426,3 +428,5 @@ uint32 PulseAudioOutputStream::RunDataCallback(
 
   return 0;
 }
+
+}  // namespace media