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With the non-NetworkService path now removed, only the
URLRequest::Delegate auth path is used.

This CL leaves a supporting enum and callback in NetworkDelegate, which
aren't used by NetworkDelegate, but are still used. I'll figure out
where to move them in another CL.

Bug: 934009
Change-Id: Icf5f8344ca0326c7ac0bbd72440ad602f65c3363
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798886Reviewed-by: Eric Roman <eroman@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695824}