Roll libvpx to 4cf4c94ad166.

Relevant updates:

4cf4c94ad166: Fix to rd cost computation for motion vector bias 
(issue: http://code.google.com/p/webm/issues/detail?id=486)

f6886c4b9328: post-proc: fix 0 or negative threshold handling
4c53bacce4a9: post-proc: deblock filter optimization
(issues: http://code.google.com/p/webm/issues/detail?id=480
         http://code.google.com/p/webm/issues/detail?id=479)
Review URL: https://webrtc-codereview.appspot.com/909004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/src@2962 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/modules/video_coding/codecs/test/videoprocessor_integrationtest.cc b/modules/video_coding/codecs/test/videoprocessor_integrationtest.cc
index a7a2b3e..0d7a06c 100644
--- a/modules/video_coding/codecs/test/videoprocessor_integrationtest.cc
+++ b/modules/video_coding/codecs/test/videoprocessor_integrationtest.cc
@@ -564,7 +564,7 @@
   SetCodecParameters(&process_settings, 0.0f, -1, 1, true, true, true, false);
   // Metrics for expected quality.
   QualityMetrics quality_metrics;
-  SetQualityMetrics(&quality_metrics, 37.0, 33.0, 0.90, 0.90);
+  SetQualityMetrics(&quality_metrics, 36.95, 33.0, 0.90, 0.90);
   // Metrics for rate control.
   RateControlMetrics rc_metrics[1];
   SetRateControlMetrics(rc_metrics, 0, 0, 40, 20, 10, 15, 0);