Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: I4062fea76f0db405e38f5f5b7d8b78409ff57357
Reviewed-on: https://chromium-review.googlesource.com/1209787
Commit-Queue: Florian Sattler <sattlerf@google.com>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55715}