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To simplify the UI, we remove the omnibox icon when third-party
cookie blocking is on but no cookies have been blocked.
This is similar to how the old cookies blocked icon worked.

Bug: 1019131
Change-Id: Id755ddcd10976d22cbcc67de18725382ab9eee78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886862
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710441}