NS_IMETHODIMP nsWidget::Scroll(PRInt32 aDx, PRInt32 aDy, nsRect *aClipRect) { return NS_OK; }
inline NS_IMETHOD Scroll(PRInt32 aDx, PRInt32 aDy, nsRect *aClipRect) { return NS_OK; }
NS_IMETHODIMP nsWidget::Scroll(PRInt32 aDx, PRInt32 aDy, nsRect *aClipRect){  return NS_OK;}