Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: Ibe5906fa96f2d7327bce1eff70637a2d00f99668
Reviewed-on: https://chromium-review.googlesource.com/1224030Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55865}