docs: function locationBar_toggleAutocompletePopup() {
      var dropdown = this.getElement({type: "historyDropMarker"});
      var stateOpen = this.autoCompleteResults.isOpened;
  
      this._controller.click(dropdown);
      this._controller.waitForEval("subject.isOpened == " + stateOpen,
                                   TIMEOUT, 100, this.autoCompleteResults);
    }