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This CL aligns the description in the new cookie controls of what may
happen when third party cookies are disabled to that already present on
the incognito NTP.

Bug: 1069687
Change-Id: I75578604cd55d2613b6c73686a92fb5c1835947b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145883Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Cr-Commit-Position: refs/heads/master@{#759640}