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Introduce a toggle in the incognito ntp that links to cookie controls setting.
Layout should be fixed in a subsequent cl.

Bug: 967668
Change-Id: Icedcae6575ae84b1ed6ef2feb353e0f0ae1b37c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1826900
Commit-Queue: Huanzhong Huang <huanzhong@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703257}