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Thumbnails have been deprecated as of M69. Removing the multi-iframe
thumbnails used in third-party NTPs.

Bug: 893362
Change-Id: I6dbc1ddf8a204d9661f437bb0b0db30888ec48dd
Reviewed-on: https://chromium-review.googlesource.com/c/1324449
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Ramya Nagarajan <ramyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610234}