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

content/renderer/media/webrtc_audio_device_impl.cc

Index: content/renderer/media/webrtc_audio_device_impl.cc
===================================================================
--- content/renderer/media/webrtc_audio_device_impl.cc	(revision 163045)
+++ content/renderer/media/webrtc_audio_device_impl.cc	(working copy)
@@ -15,10 +15,11 @@
 #include "media/audio/audio_util.h"
 #include "media/audio/sample_rates.h"
 
-using content::AudioDeviceFactory;
 using media::AudioParameters;
 using media::ChannelLayout;
 
+namespace content {
+
 static const int64 kMillisecondsBetweenProcessCalls = 5000;
 static const double kMaxVolumeLevel = 255.0;
 
@@ -1164,3 +1165,5 @@
 void WebRtcAudioDeviceImpl::SetSessionId(int session_id) {
   session_id_ = session_id;
 }
+
+}  // namespace content