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The idp_endpoint property today of the .well-known/webid response is now
taken as an absolute URL, which makes it inconvenient for deployment.

In this CL we resolve the idp_endpoint URL as a relative URL to the file
that it is contained in, allowing both absolute URLs and relative URLs
to co-exist.

Bug: 1141125
Change-Id: I224274634e5eaf7f7d66d044931fe5823f346829
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631295
Auto-Submit: Sam Goto <goto@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844993}