Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: If9a66df529dc5870f6d5146d9a83d22367ffdc59
Reviewed-on: https://chromium-review.googlesource.com/1224114Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55883}