Replace MessageLoopProxy with SingleThreadTaskRunner for the rest of media/.

media/video/capture/video_capture_device_unittest.cc

Index: media/video/capture/video_capture_device_unittest.cc
diff --git a/media/video/capture/video_capture_device_unittest.cc b/media/video/capture/video_capture_device_unittest.cc
index f9d0ab2cb8abe84fbf7f06419b973d628b1e6c98..a25d19e55fb0acec8547b866c9b19eccae66277c 100644
--- a/media/video/capture/video_capture_device_unittest.cc
+++ b/media/video/capture/video_capture_device_unittest.cc
@@ -5,8 +5,6 @@
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_loop.h"
-#include "base/message_loop/message_loop_proxy.h"
 #include "base/run_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/test/test_timeouts.h"
@@ -96,7 +94,7 @@ class MockClient : public media::VideoCaptureDevice::Client {
   }
 
  private:
-  scoped_refptr<base::MessageLoopProxy> main_thread_;
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_;
   base::Closure frame_cb_;
 };