nsContentSink::StartLayout(mFrameset != nsnull);
nsContentSink::StartLayout(!!mFrameset);
HTMLContentSink::StartLayout(){  if (mLayoutStarted) {    return;  }  mLayoutStarted = PR_TRUE;  mLastNotificationTime = PR_Now();  mHTMLDocument->SetIsFrameset(mFrameset != nsnull);  nsContentSink::StartLayout(mFrameset != nsnull);}