void SetMutationListeners(PRUint32 aType) { mMutationBits |= aType; }
void SetMutationListeners(PRUint32 aType) { nsPIDOMWindow *win = GetCurrentInnerWindow();  if (!win) { win = this; }  win->mMutationBits |= aType; }
  void SetMutationListeners(PRUint32 aType) { mMutationBits |= aType; }