Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: I85fc4ba0e4188d60d15e389e4682541c65324b55
Reviewed-on: https://chromium-review.googlesource.com/1227071
Commit-Queue: Florian Sattler <sattlerf@google.com>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55920}