update types

Author: 200Puls

iron-form.d.ts

@@ -136,6 +136,7 @@ interface IronFormElement extends Polymer.Element {
   _handleFormResponse(event: any): void;
   _handleFormError(event: any): void;
   _makeAjaxRequest(json: any): void;
+  _getResettableElements(): any;
   _getValidatableElements(): any;
   _getSubmittableElements(): any;
   _serializeElementValues(element: any): any;