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This change causes |attach_same_site_cookies|, which is used for
requests initiated by extensions, always attach SameSite cookies (as
the name implies). Previously, it would only attach SameSite cookies if
the request context was Lax or better, which would cause cross-site
requests (i.e. most requests initiated by extensions) to exclude
SameSite cookies.

Bug: 1007973
Change-Id: Ic5d04df3915e812b743bad8b44efff30fd2de795
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824553Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699826}