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This happens when clearing browser data, and forces the NTP
to be recreated (and not show previous NTP tiles).

Bug: 905735
Change-Id: If818e02703c7324f0a660bf6b115603db3682b74
Reviewed-on: https://chromium-review.googlesource.com/c/1339340Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608947}