Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: I46b96899f0a5973f2fbf8af94eb43d14955a3f45
Reviewed-on: https://chromium-review.googlesource.com/1227072Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55978}