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This change converts the site_url param to a SiteInfo in preparation
for adding new checks that are based on other SiteInfo fields. This is
part of an ongoing effort to replace site URL usage in method
signatures with SiteInfo.

Bug: 1085275
Change-Id: I67cc62db168f1d107890f66970041796ea9dcb8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401333
Commit-Queue: Aaron Colwell <acolwell@chromium.org>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Auto-Submit: Aaron Colwell <acolwell@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805520}