nsCOMPtr<nsILoadGroup> group = do_QueryReferent(mLoadGroup);
nsCOMPtr<nsISupports> loadContext = do_QueryReferent(mLoadContext);
ImageNetContextImpl::Clone(){  ilINetContext *cx;  nsCOMPtr<nsILoadGroup> group = do_QueryReferent(mLoadGroup);  //mReconnectArg is ImageGroup. If GetURL is triggered  //by timer for animation, ImageGroup may have been unloaded  //before timer kicks off.  //mReconnectCallback=nsnull; mReconnectArg=nsnull;  if (NS_NewImageNetContext(&cx, group, mReconnectCallback, mReconnectArg) == NS_OK)  {    return cx;  }  else {    return nsnull;  }}