Method remove

third_party/subscriptions-project/swg.js:18786–18801

* @param {string} key * @param {boolean=} useLocalStorage * @return {!Promise}

(key, useLocalStorage = false)

   * @return {!Promise}
   */
  remove(key, useLocalStorage = false) {
    delete this.values_[key];
    return new Promise((resolve) => {
      const storage = useLocalStorage
        ? this.win_.localStorage
        : this.win_.sessionStorage;
      if (storage) {
        try {
          storage.removeItem(storageKey(key));
        } catch (e) {
          // Ignore error.
        }
      }
      resolve();
    });
  }
}

/**