Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: I62ef9a644bd8ba68c44e8e224e54e8c20c3442c7
Reviewed-on: https://chromium-review.googlesource.com/1225795Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55929}