Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: Ie0591d8f32ebd4b9681ef9eeec092e30b73bd0b8
Reviewed-on: https://chromium-review.googlesource.com/1224172Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55902}