mFrames.ReplaceFrame(this, aOldFrame, aNewFrame, PR_TRUE);  return ChildListChanged(nsIDOMMutationEvent::MODIFICATION); }
  ReplaceFrame(nsPresContext* aPresContext,               nsIPresShell&   aPresShell,               nsIAtom*        aListName,               nsIFrame*       aOldFrame,               nsIFrame*       aNewFrame)  {    nsresult rv = nsBlockFrame::ReplaceFrame(aPresContext, aPresShell, aListName, aOldFrame, aNewFrame);    nsMathMLContainerFrame::ReLayoutChildren(aPresContext, this);    return rv;  }