SiteDetails: use the Origin instead of the URL.
SiteDetails: use the Origin instead of the URL.

This lets us more correctly identify the site, in particular for
window.open/about:blank, and blob URLs.

BUG=498580
TEST=SiteDetailsBrowserTest

Review URL: https://codereview.chromium.org/1487933002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#363048}

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