Backport 11b5297 from upstream: Make cpplint happy.

Backport a commit from V8 master that makes our Presubmit checks work again after moving Chromium to M40:

> Make cpplint happy.
>
> TBR=machenbach@chromium.org
>
> Review URL: https://codereview.chromium.org/783913003
>
> Cr-Commit-Position: refs/heads/master@{#25699}