Bug 1015380 - Fix up UITour.jsm. r=gijs

browser/modules/UITour.jsm

@@ -635,17 +635,9 @@ this.UITour = {
   },
 
   sendPageCallback: function(aDocument, aCallbackID, aData = {}) {
-    let detail = Cu.createObjectIn(aDocument.defaultView);
-    detail.data = Cu.createObjectIn(detail);
-
-    for (let key of Object.keys(aData))
-      detail.data[key] = aData[key];
-
-    Cu.makeObjectPropsNormal(detail.data);
-    Cu.makeObjectPropsNormal(detail);
-
-    detail.callbackID = aCallbackID;
 
+    let detail = {data: aData, callbackID: aCallbackID};
+    detail = Cu.cloneInto(detail, aDocument.defaultView);
     let event = new aDocument.defaultView.CustomEvent("mozUITourResponse", {
       bubbles: true,
       detail: detail