gdk_window_remove_filter(mozarea->toplevel_window, toplevel_window_filter, mozarea);
remove_toplevel_listener(mozarea);
gtk_mozarea_destroy(GtkObject *object){  GtkMozArea *mozarea;  g_return_if_fail(GTK_IS_MOZAREA(object));    mozarea = GTK_MOZAREA(object);  /* remove the filter on the toplevel window */  gdk_window_remove_filter(mozarea->toplevel_window, toplevel_window_filter,                           mozarea);  GTK_OBJECT_CLASS(parent_class)->destroy(object);}