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

media/audio/sounds/test_data.h

Index: media/audio/sounds/test_data.h
diff --git a/media/audio/sounds/test_data.h b/media/audio/sounds/test_data.h
index c94505d0ec672e39385d9374346765f0e8e25dcb..8e14076d370e5d6271a37cf9e61fb6e3670cfce9 100644
--- a/media/audio/sounds/test_data.h
+++ b/media/audio/sounds/test_data.h
@@ -10,12 +10,10 @@
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "media/audio/sounds/audio_stream_handler.h"
 
-namespace base {
-class MessageLoop;
-}
-
 namespace media {
 
 const int kTestAudioKey = 1000;
@@ -40,7 +38,7 @@ class TestObserver : public AudioStreamHandler::TestObserver {
   int cursor() const { return cursor_; }
 
  private:
-  base::MessageLoop* loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::Closure quit_;
 
   int num_play_requests_;