[Cast] Clean-up: Move max_unacked_frames into CongestionControl.

media/cast/receiver/video_decoder_unittest.cc

Index: media/cast/receiver/video_decoder_unittest.cc
diff --git a/media/cast/receiver/video_decoder_unittest.cc b/media/cast/receiver/video_decoder_unittest.cc
index 1397b570acfbcdaf3129c28d95230e0f05cff7ec..2184707efb3c54c177041c0db9f9ede7215c2d56 100644
--- a/media/cast/receiver/video_decoder_unittest.cc
+++ b/media/cast/receiver/video_decoder_unittest.cc
@@ -40,7 +40,7 @@ class VideoDecoderTest : public ::testing::TestWithParam<Codec> {
  public:
   VideoDecoderTest()
       : cast_environment_(new StandaloneCastEnvironment()),
-        vp8_encoder_(GetVideoSenderConfigForTest(), 0),
+        vp8_encoder_(GetVideoSenderConfigForTest()),
         cond_(&lock_) {
     vp8_encoder_.Initialize();
   }