window.history / window.navigator should not be replaceable as per: https://html.spec.whatwg.org/multipage/browsers.html#the-window-object Firefox and Chrome already match the specification.
Created attachment 271695 [details] Patch
<rdar://problem/24728508>
<rdar://problem/24728515>
Comment on attachment 271695 [details] Patch Clearing flags on attachment: 271695 Committed r196797: <http://trac.webkit.org/changeset/196797>
All reviewed patches have been landed. Closing bug.