Followup from r163843. I missed a line when relanding the change.

BUG=304341
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/115073002

git-svn-id: svn://svn.chromium.org/blink/trunk@163879 bbb929c8-8fbe-4397-9dbb-9b2b20218538