docs: function engineManager_removeEngine(name) {
      this.selectedEngine = name;
  
      var button = this.getElement({type: "engine_button", subtype: "remove"});
      this._controller.click(button);
  
      this._controller.waitForEval("subject.manager.selectedEngine != subject.removedEngine", TIMEOUT, 100,
                                   {manager: this, removedEngine: name});
    }