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Use more C++11. Fix nits and lint errors along the way.

Change-Id: I8d905472cbae1568be1f3ce5b8866b0cb564335a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1843313Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704746}