michael@0: if (typeof Cc === "undefined")
michael@0:   Cc = Components.classes;
michael@0: if (typeof Ci === "undefined")
michael@0:   Ci = Components.interfaces;
michael@0: 
michael@0: function destroy_transient_docshell() {
michael@0:   var docshell = Cc["@mozilla.org/docshell;1"].createInstance(Ci.nsIDocShell);
michael@0:   docshell.QueryInterface(Ci.nsILoadContext).usePrivateBrowsing = true;
michael@0:   do_test_pending();
michael@0:   do_timeout(0, Components.utils.forceGC);
michael@0: }
michael@0: 
michael@0: function run_test() {
michael@0:   var obs = {
michael@0:     observe: function(aSubject, aTopic, aData) {
michael@0:       do_check_eq(aTopic, "last-pb-context-exited");
michael@0:       do_test_finished();
michael@0:     }
michael@0:   };
michael@0:   var os = Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);
michael@0:   os.addObserver(obs, "last-pb-context-exited", false);
michael@0:   destroy_transient_docshell();
michael@0: }