Auto-rebaseline for r178888

http://src.chromium.org/viewvc/blink?view=revision&revision=178888

BUG=259547
TBR=pkasting@chromium.org

Review URL: https://codereview.chromium.org/419683011

git-svn-id: svn://svn.chromium.org/blink/trunk@178984 bbb929c8-8fbe-4397-9dbb-9b2b20218538