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Follow-up to crrev.com/c/1793260. Adds a test for SSL committed
interstitials.

Bug: 1017406
Change-Id: I47741700c5233ef6f238b3e2b61692d5a4b10cfc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900405
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713199}