change scale down by 4 to use rounding.
TBR=harryjin@google.com BUG=libyuv:447 Review URL: https://codereview.chromium.org/1525033005 .
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TBR=harryjin@google.com BUG=libyuv:447 Review URL: https://codereview.chromium.org/1525033005 .