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This is a reland of c9078153
which was reverted because it triggered a bug fixed in
http://crrev.com/c/1483732 .

Original change's description:
> Hide URL from lookalike URL warning interstitial.
>
> This CL adds support for hiding of URLs in the omnibox by security
> interstitials so as to enable it for the lookalike URL interstitial.
>
> Bug: 927924
> Change-Id: I2a7c7311480d6626d2ef27572e326c0a473dc20b
> Reviewed-on: https://chromium-review.googlesource.com/c/1478358
> Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
> Reviewed-by: Michael Wasserman <msw@chromium.org>
> Reviewed-by: Carlos IL <carlosil@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#634067}

Bug: 927924
Change-Id: I14e5db4d7eec03b060df25569fa38ce1cd1e8522
Reviewed-on: https://chromium-review.googlesource.com/c/1482940Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635221}