R=mvstanton@chromium.org
BUG=chromium:770581
TEST=mjsunit/regress/regress-crbug-770581

Change-Id: I3a5854b6534e67da3e28d9c713830808013675b5
Reviewed-on: https://chromium-review.googlesource.com/702378Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48375}