Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: I6cd63aa164af2e3b4a846933899a9a1baa54b1ef
Reviewed-on: https://chromium-review.googlesource.com/1224032Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55921}