static void EnsureHistoryIframePresence ()
{
if (ensure_history_iframe_presence == null)
ensure_history_iframe_presence = htmlpage.GetMethod ("EnsureHistoryIframePresence", StaticNonPublic);
try {
ensure_history_iframe_presence.Invoke (null, null);
}
catch (TargetInvocationException tie) {
throw tie.InnerException;
}
}