Bug 899238 - Make sure CPOW parent is never null (r=dvander).

js/ipc/JavaScriptParent.cpp

@@ -562,12 +562,14 @@ JavaScriptParent::unwrap(JSContext *cx, ObjectId objId)
 
     bool callable = !!(objId & OBJECT_IS_CALLABLE);
 
+    RootedObject global(cx, JS_GetGlobalForScopeChain(cx));
+
     RootedValue v(cx, UndefinedValue());
     JSObject *obj = NewProxyObject(cx,
                                    &CPOWProxyHandler::singleton,
                                    v,
                                    NULL,
-                                   NULL,
+                                   global,
                                    callable ? ProxyIsCallable : ProxyNotCallable);
     if (!obj)
         return NULL;