ref: 74dc64056535c317aff8b8f5e328922fc790eaa8
parent: 81e25512c3d330ce1ec1ef8dc31867e2aee957e3
author: Jerome Jiang <jianj@google.com>
date: Tue Jun 27 09:20:02 EDT 2017
vp9: Remove avg2x2 in skin detection and clean up. Change-Id: I6510e36866138f8ac4cb82c207e58e0b9522e499