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Followup CLs will change how speculative RFH is cleaned up by relying on
the fact that provisional frames are now owned by the frame they will
replace in the renderer. Add tests to ensure nothing breaks in those
followups.

Bug: 838348
Change-Id: I66d34aa8ce1d5b2d65468c63c6629e58243080c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586525
Commit-Queue: Charlie Reis <creis@chromium.org>
Auto-Submit: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Aaron Colwell <acolwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836385}