nsIControllers  *Controllers() const { return mSlots ? mSlots->mControllers.get() : nsnull; }
nsIControllers *Controllers() { nsDOMSlots* slots = GetExistingDOMSlots(); return slots ? slots->mControllers : nsnull; }
    nsIControllers  *Controllers() const { return mSlots ? mSlots->mControllers.get() : nsnull; }