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This caches the results of IsTLSDeprecationConfigControlSite() in
SecurityStateTabHelper, ensuring that all callers get a consistent
result for |is_legacy_tls_control_site| for the duration of the page
visit.

Bug: 1011089
Change-Id: I7564e54c509ab927d0e3a3212859444ae4b02804
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838302
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704775}