fixup! BB 43525: Skip Remote Settings for search engine customization.

      return this.#getConfigurationPromise;

    }

    let { promise, resolve } = Promise.withResolvers();

    this.#getConfigurationPromise = promise;

    this.#configuration = await (

      await fetch(

        "chrome://global/content/search/base-browser-search-engines.json"

      )

    ).json();

    resolve(this.#configuration);

    this.#getConfigurationPromise = Promise.all([

      this.#getConfiguration(),

      this.#getConfigurationOverrides(),

    ]);

    let remoteSettingsData = await this.#getConfigurationPromise;

    this.#configuration = remoteSettingsData[0];

    this.#getConfigurationPromise = null;

    if (!this.#configuration?.length) {

      throw Components.Exception(

        "Failed to get engine data from Remote Settings",

        Cr.NS_ERROR_UNEXPECTED

      );

    }

    /**

     * Records whether the listeners have been added or not.

     */

    if (!this.#listenerAdded) {

      this.#remoteConfig.on("sync", this.#boundOnConfigurationUpdated);

      this.#remoteConfigOverrides.on(

        "sync",

        this.#boundOnConfigurationOverridesUpdated

      );

      /**

       * Records whether the listeners have been added or not.

       */

      this.#listenerAdded = true;

    }

    this.#selector.setSearchConfig(

      JSON.stringify({ data: this.#configuration })

    );

    this.#selector.setConfigOverrides(JSON.stringify({ data: [] }));

    this.#selector.setConfigOverrides(

      JSON.stringify({ data: remoteSettingsData[1] })

    );

    return this.#configuration;

  }

    }

  }

  /**

   * Obtains the configuration overrides from remote settings.

   *

   * @returns {Promise<object[]>}

   *   An array of objects in the database, or an empty array if none

   *   could be obtained.

   */

  async #getConfigurationOverrides() {

    let result = [];

    try {

      result = await this.#remoteConfigOverrides.get();

    } catch (ex) {

      // This data is remote only, so we just return an empty array if it fails.

    }

    return result;

  }

  /**

   * @type {InstanceType<typeof lazy.SearchEngineSelector>?}

   */