Simplify VideoDecodeEngine interface by making everything synchronous.

media/base/mock_filters.h

Index: media/base/mock_filters.h
diff --git a/media/base/mock_filters.h b/media/base/mock_filters.h
index 8199b885fbd4e486fab876c1157c959230d17b91..d00825d8713f956a29663f22e31573e4dd434d2a 100644
--- a/media/base/mock_filters.h
+++ b/media/base/mock_filters.h
@@ -187,13 +187,9 @@ class MockVideoDecoder : public VideoDecoder {
   MOCK_METHOD3(Initialize, void(DemuxerStream* stream,
                                 const base::Closure& callback,
                                 const StatisticsCallback& stats_callback));
-  MOCK_METHOD1(ProduceVideoFrame, void(scoped_refptr<VideoFrame>));
+  MOCK_METHOD1(Read, void(const ReadCB& callback));
   MOCK_METHOD0(natural_size, gfx::Size());
 
-  void VideoFrameReadyForTest(scoped_refptr<VideoFrame> frame) {
-    VideoDecoder::VideoFrameReady(frame);
-  }
-
  protected:
   virtual ~MockVideoDecoder();