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When Isolated Prerender encounters an ineligible redirect that is not
the final URL, the after srp metrics do not get correctly updated. This
CL fixes that by checking the whole redirect chain from the end to the
beginning for metrics.

Note that in practice this is only likely to affect the metrics on
AMP pages and ads, since the Google SRP shortcuts redirect chains that
Google doesn't otherwise create.

Bug: 1106942
Change-Id: I26499291a4e8039d78524daf0d34dd4bc383af69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2307535Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790084}