mFrames.DestroyFrame(aPresContext, aOldFrame); return ChildListChanged(aPresContext, nsIDOMMutationEvent::REMOVAL); }
nsMathMLContainerFrame::RemoveFrame(nsIPresContext* aPresContext,                                    nsIPresShell&   aPresShell,                                    nsIAtom*        aListName,                                    nsIFrame*       aOldFrame){  if (aListName) {    return NS_ERROR_INVALID_ARG;  }  // remove the child frame  mFrames.DestroyFrame(aPresContext, aOldFrame);  return ChildListChanged(aPresContext, nsIDOMMutationEvent::REMOVAL);}