Add Location.p.ancestorOrigins (#5977)
Add Location.p.ancestorOrigins (#5977)

See https://trac.webkit.org/changeset/113945/webkit
and https://trac.webkit.org/log/webkit/tags/Safari-536.7/Source
chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data