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The boolean BlockThirdPartyCookies preference was replaced by
CookieControlsMode enum. Existing settings were migrated since M83.

Fix handling of CookieControlsMode::kIncognitoOnly state, which is
the new default, where 3p cookies are allowed in regular mode
but blocked in incognito mode. Previously the extension api would
not report the state correctly in incognito mode unless it is explicitly
set to block or allow.

Bug: 1104836
Change-Id: Idad018d7a23aca913888fe6a66eb0502e26525a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367095
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803152}