message: refactor(rxSubscriber): stop using root
diff: -import { root } from '../util/root';
  -
  -const Symbol: any = root.Symbol;
  -
  -export const rxSubscriber = (typeof Symbol === 'function' && typeof Symbol.for === 'function') ?
  - Symbol.for('rxSubscriber') : '@@rxSubscriber';
  +export const rxSubscriber =
  + (typeof Symbol === 'function' && typeof Symbol.for === 'function')
  + ? Symbol.for('rxSubscriber')
  + : '@@rxSubscriber';
  /**
  * @deprecated use rxSubscriber instead
  