PRIntn n = aLine->mChildCount;
PRInt32 n = aLine->ChildCount();
nsBlockFrame::SlideFrames(LineData* aLine, nscoord aDY){  // Adjust the Y coordinate of the frames in the line  nsIFrame* kid = aLine->mFirstChild;  PRIntn n = aLine->mChildCount;  while (--n >= 0) {    nsRect r;    kid->GetRect(r);    r.y += aDY;    kid->SetRect(r);    kid->GetNextSibling(kid);  }  // Slide line box too  aLine->mBounds.y += aDY;}