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Put incognito ntp cookie controls logic in a class and replaced
java-side logic with bridge to connect to c++ backend. Same class is
used for incognito for start surface.

Bug: 1040091
Change-Id: I18d679731aabda57c6b3852d4f0e4a68c268bb07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2044273
Commit-Queue: Ehimare Okoyomon <eokoyomon@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745417}