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SSL browser tests: Use a WaitForInterstitial() wrapper compatible with committed interstitials.

Bug: 752372
Change-Id: I931681551c7c38a42cfef5c941d620c18c4562a3
Reviewed-on: https://chromium-review.googlesource.com/773563
Commit-Queue: Lucas Garron <lgarron@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517259}