Remove calls to MessageLoop::current() in media.

media/audio/audio_device_thread.h

Index: media/audio/audio_device_thread.h
diff --git a/media/audio/audio_device_thread.h b/media/audio/audio_device_thread.h
index 1ffefc5a29146738e7a3274a2e9b1ef70e0a583a..c3be00e85014970bb4f4b5a14fa10c48d61152fb 100644
--- a/media/audio/audio_device_thread.h
+++ b/media/audio/audio_device_thread.h
@@ -17,7 +17,7 @@
 #include "media/base/media_export.h"
 
 namespace base {
-class MessageLoop;
+class SingleThreadTaskRunner;
 }
 
 namespace media {
@@ -94,11 +94,11 @@ class MEDIA_EXPORT AudioDeviceThread {
   // In the latter case, the thread will still be running after Stop()
   // returns, but the callback pointer is cleared so no further callbacks will
   // be made (IOW after Stop() returns, it is safe to delete the callback).
-  // The |loop_for_join| parameter is required for asynchronous operation
+  // The |task_runner_for_join| parameter is required for asynchronous operation
   // in order to join the worker thread and close the thread handle later via a
   // posted task.
   // If set to NULL, function will wait for the thread to exit before returning.
-  void Stop(base::MessageLoop* loop_for_join);
+  void Stop(scoped_refptr<base::SingleThreadTaskRunner> task_runner_for_join);
 
   // Returns true if the thread is stopped or stopping.
   bool IsStopped();