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- Remove unused includes.
- Use ScopedFD.
- Remove memory allocation with new.
- Remove out-parameter checks that are always true.

Change-Id: Ia4627f692057a3306f795f27b261489ca11981a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2034110Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737883}