Auto-rebaseline for r177977

http://src.chromium.org/viewvc/blink?view=revision&revision=177977

BUG=391648
TBR=jchaffraix@chromium.org

Review URL: https://codereview.chromium.org/385403004

git-svn-id: svn://svn.chromium.org/blink/trunk@178086 bbb929c8-8fbe-4397-9dbb-9b2b20218538