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This aims for a simpler method signature for
CanonicalCookie::IsSetPermittedInContext, and aims to have all exclusion
reasons (except those set by MaybeDeleteEquivalentCookieAndUpdateStatus)
set by CanonicalCookie itself.

Change-Id: Id0673d11795241f10728d90424612b1bc0ab9883
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611764Reviewed-by: Lily Chen <chlily@chromium.org>
Commit-Queue: Chris Fredrickson <cfredric@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840347}