Move a bunch of code in content\renderer to the content namespace.

content/renderer/media/render_audiosourceprovider.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 "content/renderer/media/render_audiosourceprovider.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/media/audio_device_factory.h"
 #include "content/renderer/media/audio_renderer_mixer_manager.h"
 #include "content/renderer/render_thread_impl.h"
 #include "media/base/audio_renderer_mixer_input.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProviderClient.h"
 
-using content::AudioDeviceFactory;
-using content::AudioRendererMixerManager;
 using std::vector;
 using WebKit::WebVector;
 
+namespace content {
+
 RenderAudioSourceProvider::RenderAudioSourceProvider()
     : is_initialized_(false),
       channels_(0),
       sample_rate_(0),
       is_running_(false),
       renderer_(NULL),
       client_(NULL) {
   // We create an AudioRendererSink here, but we don't yet know the audio format
   // (sample-rate, etc.) at this point.  Later, when Initialize() is called, we
   // have the audio format information and call AudioRendererSink::Initialize()
@@ skipping 108 matching lines @@
 
   if (client_) {
     // Inform WebKit about the audio stream format.
     client_->setFormat(channels_, sample_rate_);
   }
 
   is_initialized_ = true;
 }
 
 RenderAudioSourceProvider::~RenderAudioSourceProvider() {}
+
+}  // namespace content