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In particular, have it invoke net::RedirectInfo::ComputeRedirectInfo()
when an extension injects a redirect so that site-for-cookies, referrer,
method, and referrer_policy are all calculated correctly, and have
it update NetworkIsolationKey according to the value in
request_.trusted_params->update_network_isolation_key_on_redirect.

Change-Id: Ied1e0d9825b75110143881d6aac806da1f13baab
Fixed: 1053573
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057529
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746149}