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Also make more methods const and miscellaneous cleanup. No functional
changes.

Change-Id: I92004b1cdcdee52673eb71d52b6d54689d50d85b
Bug: 1010217
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363072
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799334}