offset = GetBCBorder();
offset = GetBCBorder(aPresContext);
nsTableFrame::GetContentAreaOffset(const nsHTMLReflowState* aReflowState) const{  nsMargin offset(0,0,0,0);  if (IsBorderCollapse()) {    offset = GetBCBorder();  }  else {    GetSeparateModelBorderPadding(aReflowState, *mStyleContext, offset);  }  return offset;}