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Use the existing origin, site_for_cookies and top_frame_origin values
to create an IsolationInfo object to pass into RestrictedCookieManager,
which is more aligned with the original behavior
(before https://crrev.com/c/2582608) where those three fields were
passed into RestrictedCookieManager directly.

Bug: 1166328
Change-Id: Id44edf91f15fc8fde93c483d3b4ed2fb25c02548
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2630370Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Shuran Huang <shuuran@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844153}