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Don't layer the sad tab overlay over the NTP, since it doesn't matter of the web
process bails for about://newtab.  Interestingly enough, this is a possible
outcome.

Bug: 932618
Change-Id: I9cc2afdb0e5ca6ac9de9a9e8ad91146574392e99
Reviewed-on: https://chromium-review.googlesource.com/c/1475793
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Auto-Submit: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632729}