Move AudioDevice and AudioInputDevice to media.

media/audio/scoped_loop_observer.cc

Index: media/audio/scoped_loop_observer.cc
===================================================================
--- media/audio/scoped_loop_observer.cc	(revision 148738)
+++ media/audio/scoped_loop_observer.cc	(working copy)
@@ -2,11 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/renderer/media/scoped_loop_observer.h"
+#include "media/audio/scoped_loop_observer.h"
 
 #include "base/bind.h"
 #include "base/synchronization/waitable_event.h"
 
+namespace media {
+
 ScopedLoopObserver::ScopedLoopObserver(
     const scoped_refptr<base::MessageLoopProxy>& loop)
     : loop_(loop) {
@@ -41,3 +43,5 @@
   if (done)
     done->Signal();
 }
+
+}  // namespace media.