r427784 originally landed as r427752, but failed with an error.
Earlier, r427683 landed, adding the same #include. Rather than
conflicting, the CQ somehow ignored this. Thus when r427752 got reverted
as r427772, the #include got deleted, and the build failed.
TBR=hongchan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Review-Url: https://codereview.chromium.org/2453103002
Cr-Commit-Position: refs/heads/master@{#427785}