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This CL adds a test to make sure we don't display the NTP if the loaded
page is an interstitial page.

Fixed: 1067250
Change-Id: If0b28650148acee4f1379028826ca1cc603834f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151451
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759591}