Revert 208403 "Remove MediaStreamDeviceThread in favor of using ..."

trunk/src/content/browser/renderer_host/media/media_stream_manager.h

Index: trunk/src/content/browser/renderer_host/media/media_stream_manager.h
===================================================================
--- trunk/src/content/browser/renderer_host/media/media_stream_manager.h	(revision 210020)
+++ trunk/src/content/browser/renderer_host/media/media_stream_manager.h	(working copy)
@@ -35,6 +35,10 @@
 #include "content/common/media/media_stream_options.h"
 #include "content/common/content_export.h"
 
+namespace base {
+class Thread;
+}
+
 namespace media {
 class AudioManager;
 }
@@ -203,7 +207,7 @@
   void StopMonitoring();
 
   // Device thread shared by VideoCaptureManager and AudioInputDeviceManager.
-  scoped_refptr<base::MessageLoopProxy> device_loop_;
+  scoped_ptr<base::Thread> device_thread_;
 
   media::AudioManager* const audio_manager_;  // not owned
   scoped_refptr<AudioInputDeviceManager> audio_input_device_manager_;