message: also remove disconnecting from ResizeObserver
diff: @@ -178,10 +178,6 @@ module.exports = React.createClass({
  //
  // (We could use isMounted(), but facebook have deprecated that.)
  this.unmounted = true;
  - if (this._timelineSizeObserver) {
  - this._timelineSizeObserver.disconnect();
  - this._timelineSizeObserver = null;
  - }
  },
  onScroll: function(ev) {
  