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This test was added as part of a fix for a crash that occurred due to
interstitials not having an associated web contents.
With committed interstitials enabled, interstitials are no longer a
special case, and do have a web contents, so the special conditions
that are checked in this test no longer apply.

Bug: 752372
Change-Id: Id06e38674dd17f97a467f98b5759433aad8cd6ec
Reviewed-on: https://chromium-review.googlesource.com/c/1313675Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607634}