BUG=v8:6291, v8:811
R=marja@chromium.org, vogelheim@chromium.org

Change-Id: Icf18b1cba8562aab87d233d383eb1d73a8e6aa9d
Reviewed-on: https://chromium-review.googlesource.com/485059
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44818}