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NTP thumbnails have been deprecated as of M69.

Remove forced URLs and thumbnail data from TopSitesDatabase. This
includes renaming the "thumbnails" table to "top_sites"; removing all
columns except url, url_rank, title, and redirects; and all rows for
forced sites.

Forced sites were only used to store thumbnails for Most Likely sites.

Bug: 893362
Change-Id: I0fe5662869db014d62002575fdaaebf29ece9359
Reviewed-on: https://chromium-review.googlesource.com/c/1383139
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618360}