Block cross-site top-frame navigations from untrusted iframes.
<rdar://problem/58320516>
Created attachment 387263 [details] Patch
Comment on attachment 387263 [details] Patch r=me
Comment on attachment 387263 [details] Patch Clearing flags on attachment: 387263 Committed r254322: <https://trac.webkit.org/changeset/254322>
All reviewed patches have been landed. Closing bug.