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Use more C++11 features and fix nits.

Change-Id: I85f4c34190301cd8117095632430cdc991477567
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1843259Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703895}