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This updates CookieStoreAPI to return EffectiveSameSite across all
of its endpoints. If EffectiveSameSite is not available it will
fall back to using SameSite.

Bug: 1065010, 1092695
Change-Id: I26b0dd8e9ccbf3a57c3eef1a828d94fb4ce14568
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295927
Commit-Queue: Ayu Ishii <ayui@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792337}