NS_IMETHODIMP_(nsrefcnt) nsWebShell::Release(void)
nsWebShellFactory::Release()
NS_IMETHODIMP_(nsrefcnt) nsWebShell::Release(void){  NS_PRECONDITION(0 != mRefCnt, "dup release");  --mRefCnt;  if (mRefCnt == 0) {    NS_DELETEXPCOM(this);    return 0;  }  return mRefCnt;}