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Fixes some flake in the EG tests, and catches an error in the previous CL
crrev.com/c/1339340.  The NTP should not be created while web usage is disabled.

Bug: 905735
Change-Id: I8bd3d942c3594e4706e29ed0478a935a10602727
Reviewed-on: https://chromium-review.googlesource.com/c/1341208Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609148}