message: refactor(windowToggle): remove unnecessary assignment
diff: @@ -92,7 +92,6 @@ export function windowToggle<T, O>(
  window.complete();
  closingSubscription.unsubscribe();
  };
  - const closingSubscriber = new OperatorSubscriber(subscriber, closeWindow, handleError, closeWindow);
  let closingNotifier: Observable<any>;
  try {
  @@ -104,7 +103,7 @@ export function windowToggle<T, O>(
  subscriber.next(window.asObservable());
  - closingSubscription.add(closingNotifier.subscribe(closingSubscriber));
  + closingSubscription.add(closingNotifier.subscribe(new OperatorSubscriber(subscriber, closeWindow, handleError, closeWindow)));
  },
  undefined,
  noop
  