Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: If912b9d43f577ca3e9f3b8b27acf957c49e269dc
Reviewed-on: https://chromium-review.googlesource.com/1224113Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55979}