Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: Ibdb4b81e1ba764d73bac6592eeef5783097076fc
Reviewed-on: https://chromium-review.googlesource.com/1225896Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55965}