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This flag will control if the same-site calculation will take the scheme
of the site-for-cookies and the request/response url into account when
determining same-site-ness or cross-site-ness.

Bug: 1030938
Change-Id: I206accc412cc8e2f4d3c65b8d3ab248bb3fa66bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062636Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Commit-Queue: Steven Bingler <bingler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743377}