Some tests fail after harfbuzz update.

TBR=wangxianzhu@chromium.org
BUG=353015

Review URL: https://codereview.chromium.org/201413002

git-svn-id: svn://svn.chromium.org/blink/trunk@169311 bbb929c8-8fbe-4397-9dbb-9b2b20218538