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Various unused or redundant APIs are removed trivially.

Bug: 681921
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I6e5b85b69a002b1037e1ee4f778f29af31af1525
Reviewed-on: https://chromium-review.googlesource.com/952922Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541752}