mPrintEngine->SetIsPrinting(PR_FALSE);  nsCOMPtr<nsIContentViewer> cv(do_QueryInterface(mDocViewerPrint)); if (cv) { cv->Destroy(); } }
  virtual ~nsPagePrintTimer()  {    if (mTimer) {      mTimer->Cancel();    }    DocumentViewerImpl::mIsDoingPrinting = PR_FALSE;    mDocViewer->Destroy();    NS_RELEASE(mDocViewer);  }