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To ensure that the two related preferences, cookie_controls_mode and
block_third_party_cookies remain in a consistent state, this CL updates
the existing block_third_party_cookies toggle located in settings
to update both preferences.

Bug: 1068144
Change-Id: Ia64cb37c766a3143c6ac986efc67e87283852a8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134261Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Cr-Commit-Position: refs/heads/master@{#757019}