Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: Ibc3dedb0bce78ddce4004ee386757ce504bb073a
Reviewed-on: https://chromium-review.googlesource.com/1226792
Commit-Queue: Florian Sattler <sattlerf@google.com>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55931}