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Add tests to load bad SSL pages and navigate back/forward/proceed.

Bug: none
Change-Id: I69ca6998a4477515ac63ad201ef7bc6491c8ddeb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618138
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841555}