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This change should be a no-op. It is mostly comment changes, with a few
code changes removing unused enum values and a settings provider class
(which was accidentally added back in after I removed it previously).

Bug: 768027
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ia26788b970fbaa6c25eda9cce7758ad626e587b3
Reviewed-on: https://chromium-review.googlesource.com/822160Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Tim Brown <timbrown@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523899}