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(Rebase of crrev.com/c/827676)

This adapts remaining SSL interstitial tests in policy_browsertest.cc,
captive_portal_blocking_page_browsertest.cc, and
security_state_tab_helper_browsertest.cc to run with committed interstitials
enabled.

There is a small handful of other relevant tests scattered throughout the
codebase, but those should be straightforward to adapt when we turn on committed
interstitials by default.

Bug: 752372
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Ic83cd3be0c2f4f95876d0bafbe8922932fa60f3c
Reviewed-on: https://chromium-review.googlesource.com/1041126
Commit-Queue: Carlos IL <carlosil@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557763}