Remember if we used legacy TLS in the back/forward cache like we remember if we have only secure content
Created attachment 390125 [details] Patch
Part of rdar://problem/59048822
Comment on attachment 390125 [details] Patch Looks great, r=me.
Created attachment 390137 [details] patch for landing
http://trac.webkit.org/r256073
<rdar://problem/59276300>