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The #include is needed for std::max.

BUG=None
TEST=git cl lint

Change-Id: Ib0a0de3191b180c7f0c9774505feecad7e248a7f
Reviewed-on: https://chromium-review.googlesource.com/c/1354401Reviewed-by: Yury Khmel <khmel@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611907}