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The New Tab Page in CCTs doesn't work quite like you'd expect (since
they don't happen in organically), so this CL prevents using the NTP
as the default "safe page" for Safety Tips when a better
recommendation isn't available.

Instead, this CL either navigates back (if possible), or closes the CCT
(if not possible). This isn't an ideal solution either, but there
probably isn't a magical option.

Bug: 1007029
Change-Id: I63f53e361d734f4b26480467f74b182612dd210b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2334591
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794672}