message: Bind the onWheel listener directly to props
  React doesn't seem to care if this is null/undefined.
diff: @@ -118,19 +118,13 @@ export default class AutoHideScrollbar extends React.Component {
  return this.containerRef.scrollTop;
  }
  - onWheel = (e) => {
  - if (this.props.onWheel) {
  - this.props.onWheel(e);
  - }
  - };
  -
  render() {
  return (<div
  ref={this._collectContainerRef}
  style={this.props.style}
  className={["mx_AutoHideScrollbar", this.props.className].join(" ")}
  onScroll={this.props.onScroll}
  - onWheel={this.onWheel}
  + onWheel={this.props.onWheel}
  >
  <div className="mx_AutoHideScrollbar_offset">
  { this.props.children }
  