Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: I1fdd9210d92725701f413ff410e3a39d96bccf66
Reviewed-on: https://chromium-review.googlesource.com/1224111
Commit-Queue: Florian Sattler <sattlerf@google.com>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55986}