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This change adds different types with which CookieAccessDelegateImpl
can be constructed. One type, USE_CONTENT_SETTINGS is the default
behavior of checking the CookieSettings to determine whether a given
cookie is Legacy or Nonlegacy. The other type, ALWAYS_LEGACY, always
returns Legacy access semantics for every cookie.

The ALWAYS_LEGACY type of CookieAccessDelegate is used for Android
WebView, for compatibility reasons. (The SameSite cookie changes would
break too much stuff, so we treat every cookie as Legacy to maintain
compatibility.)

Bug: 986319
Change-Id: I68384da121b025525da5fd2ef6f9dff25a8a2ff5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872782Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Martin Barbella <mbarbella@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708674}