Fix typo in comment

Bug: 1232705
Change-Id: Ibefae71ddf4f7c93bbf6889dc6420885fc38143e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3071603


Commit-Queue: Alisa Lin <alisalin@google.com>
Reviewed-by: Juanmi Huertas <juanmihd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#908675}