GitLab

The authentication scheme handler for Basic has a mini parser for
realms. Add a fuzzer so that we have some fuzz coverage here.

R=mmenke@chromium.org

Bug: None
Change-Id: Icc9501d41f31ad82d6e04f0ed9f610afbc7091aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1907153Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Asanka Herath <asanka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715352}