mNothingChanged = PR_FALSE;
  nsHTMLReflowMetrics(nsSize* aMaxElementSize, PRUint32 aFlags = 0) {    maxElementSize = aMaxElementSize;    mMaximumWidth = 0;    mFlags = aFlags;    mCarriedOutBottomMargin = 0;    mOverflowArea.x = 0;    mOverflowArea.y = 0;    mOverflowArea.width = 0;    mOverflowArea.height = 0;#ifdef MOZ_MATHML    mBoundingMetrics.Clear();#endif    // XXX These are OUT parameters and so they shouldn't have to be    // initialized, but there are some bad frame classes that aren't    // properly setting them when returning from Reflow()...    width = height = 0;    ascent = descent = 0;  }