mOrder = new nsVoidArray();
mOrder = new nsAutoVoidArray();
CSSDeclarationImpl::AppendComment(const nsAReadableString& aComment){  nsresult result = NS_ERROR_OUT_OF_MEMORY;  if (nsnull == mOrder) {    mOrder = new nsVoidArray();  }  if (nsnull == mComments) {    mComments = new nsStringArray();  }  if ((nsnull != mComments) && (nsnull != mOrder)) {    mComments->AppendString(aComment);    mOrder->AppendElement((void*)-mComments->Count());    result = NS_OK;  }  return result;}