removeChild method
Implementation
@override
@mustCallSuper
Node removeChild(Node child) {
  if (enableWebFProfileTracking) {
    WebFProfiler.instance.startTrackUICommandStep('Element.removeChild');
  }
  super.removeChild(child);
  // Update renderStyle tree.
  if (child is Element) {
    child.renderStyle.detach();
  }
  if (enableWebFProfileTracking) {
    WebFProfiler.instance.finishTrackUICommandStep();
  }
  return child;
}