Gardening: fast/css/font-face-woff2.html fails

Starts failing after the OTS roll, see comments on:
https://codereview.chromium.org/253223004/

BUG=368983
TBR=ksakamoto

Review URL: https://codereview.chromium.org/268543004

git-svn-id: svn://svn.chromium.org/blink/trunk@173062 bbb929c8-8fbe-4397-9dbb-9b2b20218538