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This change allows responses to extension-initiated requests to always
accept SameSite cookies. This is accomplished by looking at
the request's |accept_same_site_cookies| parameter, and if it is true,
accept any SameSite cookies from the response.

Bug: 1017300
Change-Id: I8709ac01272898bdfb92c9b5b5d7189918b91ebd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1878627Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709533}