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This CL inches closer to merging the NTLM and Negotiate handlers which
basically implement the same logic under different names.

Servicification of Negotiate handling will then not have to deal with
NTLM and Negotiate authentication schemes separately.

R=mmenke@chromium.org

Bug: 991265
Change-Id: I167d4fb5856f65319fe7c21636e6e4db61aa46a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1907151
Commit-Queue: Asanka Herath <asanka@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715246}