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Enables features to stop loading NTP from within ios/web CRWNativeContent.
Instead the NTP is presented directly from the BVC.

Also disables a failing pdf test that is already flakey on iOS11.

Bug: 826369
Test: Any interactions to navigate to or from, hide or show, an NTP.
Change-Id: I61cdcb41b2a09955f6cb994a220cd32ea8a0b602
Reviewed-on: https://chromium-review.googlesource.com/c/1332411
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607491}