nsCOMPtr<nsIPresContext> pc(do_QueryInterface(aContext));  NS_ASSERTION(pc, "not a pres context!");  return mFrame->FrameChanged(aContainer, pc, newframe, dirtyRect);
return mFrame->FrameChanged(aContainer, newframe, dirtyRect);
NS_IMETHODIMP nsBulletListener::FrameChanged(imgIContainer *aContainer, nsISupports *aContext, gfxIImageFrame *newframe, nsRect * dirtyRect){  if (!mFrame)    return NS_ERROR_FAILURE;  nsCOMPtr<nsIPresContext> pc(do_QueryInterface(aContext));  NS_ASSERTION(pc, "not a pres context!");  return mFrame->FrameChanged(aContainer, pc, newframe, dirtyRect);}