Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: I33858c6f6bb577f39f697a1d3094990a57044fca
Reviewed-on: https://chromium-review.googlesource.com/1228065
Commit-Queue: Florian Sattler <sattlerf@google.com>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55990}