Replace MessageLoopProxy with SingleThreadTaskRunner for the rest of media/.

media/audio/audio_output_proxy_unittest.cc

Index: media/audio/audio_output_proxy_unittest.cc
diff --git a/media/audio/audio_output_proxy_unittest.cc b/media/audio/audio_output_proxy_unittest.cc
index 3cffcc95cfbf73743f181e0f8b458d24a407cf06..d0198923be8d4c147f152b4dccfa8bfb87de4a4d 100644
--- a/media/audio/audio_output_proxy_unittest.cc
+++ b/media/audio/audio_output_proxy_unittest.cc
@@ -5,7 +5,6 @@
 #include <string>
 
 #include "base/message_loop/message_loop.h"
-#include "base/message_loop/message_loop_proxy.h"
 #include "media/audio/audio_manager.h"
 #include "media/audio/audio_manager_base.h"
 #include "media/audio/audio_output_dispatcher_impl.h"
@@ -106,8 +105,8 @@ class MockAudioManager : public AudioManagerBase {
   MOCK_METHOD2(MakeAudioInputStream, AudioInputStream*(
       const AudioParameters& params, const std::string& device_id));
   MOCK_METHOD0(ShowAudioInputSettings, void());
-  MOCK_METHOD0(GetMessageLoop, scoped_refptr<base::MessageLoopProxy>());
-  MOCK_METHOD0(GetWorkerLoop, scoped_refptr<base::MessageLoopProxy>());
+  MOCK_METHOD0(GetMessageLoop, scoped_refptr<base::SingleThreadTaskRunner>());
+  MOCK_METHOD0(GetWorkerLoop, scoped_refptr<base::SingleThreadTaskRunner>());
   MOCK_METHOD1(GetAudioInputDeviceNames, void(
       media::AudioDeviceNames* device_name));