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Display an extension icon if third-party cookie blocking is controlled
through an extension.

Also use a link to the new cookie settings UI if the privacy settings
redesign is enabled.

Bug: 1065392
Change-Id: I1917908a24dfe6ca711d85960689b1328fafdb16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2128489
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755175}