message: Remove unused AngularJS helper
diff: -import { IScope } from 'angular';
  -import { Observable } from 'rxjs/Observable';
  import { Subscription } from 'rxjs/Subscription';
  -/**
  - * An AngularJS helper for subscribing to RxJS Observables. When the
  - * provided scope is destroyed, the subscription will be automatically
  - * unsubscribed.
  - */
  -export function subscribeOnScope<T>(
  - $scope: IScope,
  - observable: Observable<T>,
  - subscribeFn: (T) => void
  -): Subscription {
  - const subscription = observable.subscribe(subscribeFn);
  - $scope.$on('$destroy', () => subscription.unsubscribe());
  - return subscription;
  -}
  -
  /** A helper for managing multiple subscriptions. */
  export class Subscriptions {
  private subscriptions: Subscription[] = [];
  