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To correctly apply content settings, we need to know the
top_frame_origin any time cookies are used. Currently we only have
site_for_cookies, which is empty in third_party frames.

Bug: 988398
Change-Id: Icb724aaaf89c244aa7aebdbaceb1f9a8c3c3ec91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731900
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688464}