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Swap the tiles on "toggleMostVisitedOrCustomLinks". If most visited is
enabled, build the tiles as most visited tiles and switch the blacklist
notification to the most visited style. Otherwise, build the tiles as
custom links and use custom link notifications.

Screencast: https://drive.google.com/open?id=1CfEfNDfJxl_0WV7ffKxuqNC8SZcEn0hw

Bug: 953822
Change-Id: Ie423bbc6f4f99aeea205fbc15b9f41237b93674e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1653083Reviewed-by: Kyle Milka <kmilka@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668550}