Update searchable_list test to run in package bots

web/elements/demo_app.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library searchable_list.demo_app;
-
-import 'package:polymer/polymer.dart';
-
-@CustomTag('demo-app')
-class DemoApp extends PolymerElement {
-  @observable bool applyAuthorStyles = true;
-  List<String> fruits = const [
-      'Apple', 'Apricot', 'Avocado',
-      'Banana', 'Blackberry', 'Blackcurrant', 'Blueberry',
-      'Currant', 'Cherry', 'Clementine', 'Date', 'Durian', 'Fig',
-      'Gooseberry', 'Grape', 'Grapefruit', 'Guava', 'Huckleberry',
-      'Kiwi', 'Lemon', 'Lime', 'Lychee', 'Mandarin', 'Mango',
-      'Cantaloupe', 'Honeydew melon', 'Nectarine', 'Orange',
-      'Peach', 'Pear', 'Plum', 'Pineapple', 'Pomegranate',
-      'Raspberry', 'Redcurrant', 'Star fruit', 'Strawberry',
-      'Tangerine', 'Tomato', 'Watermelon'];
-
-  DemoApp.created() : super.created();
-}