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Mostly cleanup. Note that this still uses atomics instead of C++11's
thread-safe statics. C++11's thread-safe statics incur a large (200+ KB)
size penalty since they guarantee that only one thread enters the
initialization block.

Change-Id: I3b013b55d5108f86ede39d0e0273ea10f8abf5e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2045757Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Auto-Submit: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740556}