No functional change, just a cleanup I forgot to integrate in the
reland: https://crrev.com/c/1146100

R=mstarzinger@chromium.org

Bug: v8:7977
Change-Id: Ifbb437d6a1ec9ec1b8623859bdf183dab1a1c0f6
Reviewed-on: https://chromium-review.googlesource.com/1148721Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54685}