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sameSitePolicy property was added to NSHTTPCookie with iOS 13, consider
it when switching between canonical cookies and system cookies.

Initially use CookieOption with access semantic Strict, but eventually
download_session_cookie should update the semantic based on the origin
of the request.

This CL accommodates the changes that happened recently on the canonical cookie .
So in iOS 12 we don't miss cross site non-secure cookies. and on the same time starting
from iOS 13 check on same-site policy value and follow chromium rules in sending cookies
across requests.

Bug: 1018272, 1006785
Change-Id: I77213f528a9f533998e783db897a80a990bea87d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890507Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Lily Chen <chlily@chromium.org>
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713216}