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This adds methods to net::cookie_util to check whether "SameSite by
default cookies" and "Cookies without SameSite must be Secure" are
enabled. This replaces direct checks of the FeatureList and allows
future changes to the criteria for enabling those features.

Bug: 954551, 953306
Change-Id: If2b7f92b464797b77bf01c80f5eb5511a45ef641
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1726796Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682813}