Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: I6bf929bea03a59b40f205482b7604f44e61bc6f8
Reviewed-on: https://chromium-review.googlesource.com/1209846
Commit-Queue: Florian Sattler <sattlerf@google.com>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55714}