Change media MessageLoopProxy usage to SingleThreadTaskRunners.

content/renderer/pepper/video_decoder_shim.h

Index: content/renderer/pepper/video_decoder_shim.h
diff --git a/content/renderer/pepper/video_decoder_shim.h b/content/renderer/pepper/video_decoder_shim.h
index aa33a7485f529efe2d201067578c24f69b98c120..a9c4cce0331fbf2bbc4ed640a4c2d9c3e71ba210 100644
--- a/content/renderer/pepper/video_decoder_shim.h
+++ b/content/renderer/pepper/video_decoder_shim.h
@@ -13,13 +13,16 @@
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop/message_loop_proxy.h"
 #include "gpu/command_buffer/common/mailbox.h"
 #include "media/base/video_decoder_config.h"
 #include "media/video/video_decode_accelerator.h"
 
 #include "ppapi/c/pp_codecs.h"
 
+namespace base {
+class SingleThreadTaskRunner;
+}
+
 namespace gpu {
 namespace gles2 {
 class GLES2Interface;
@@ -89,7 +92,7 @@ class VideoDecoderShim : public media::VideoDecodeAccelerator {
   State state_;
 
   PepperVideoDecoderHost* host_;
-  scoped_refptr<base::MessageLoopProxy> media_message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
   scoped_refptr<webkit::gpu::ContextProviderWebContext> context_provider_;
 
   // The current decoded frame size.