NS_IMETHOD RemoveObserver(nsIRDFObserver* n) { return mInner->RemoveObserver(n);
nsWindowMediator::RemoveObserver(nsIRDFObserver* aObserver) { if (! aObserver) return NS_ERROR_NULL_POINTER;  if (mObservers) { mObservers->RemoveElement(aObserver);
  NS_IMETHOD RemoveObserver(nsIRDFObserver* n)  {      return mInner->RemoveObserver(n);  }