Removed polymer & mirror from Observatory

runtime/observatory/lib/src/elements/nav/top_menu_wrapper.dart

-// Copyright (c) 2016, 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.
-
-import 'dart:html';
-
-import 'package:observatory/app.dart';
-import 'package:observatory/src/elements/helpers/tag.dart';
-import 'package:observatory/src/elements/shims/binding.dart';
-import 'package:observatory/src/elements/nav/top_menu.dart';
-
-@bindable
-class NavTopMenuElementWrapper extends HtmlElement {
-  static const binder = const Binder<NavTopMenuElementWrapper>(const {
-      'last': #last
-    });
-
-  static const tag = const Tag<NavTopMenuElementWrapper>('top-nav-menu');
-
-  bool _last = false;
-  
-  bool get last => _last;
-
-  set last(bool value) {
-    _last = value;
-    render();
-  }
-
-  NavTopMenuElementWrapper.created() : super.created() {
-    binder.registerCallback(this);
-    _last = _getBoolAttribute('last');
-    createShadowRoot();
-    render();
-  }
-
-  @override
-  void attached() {
-    super.attached();
-    render();
-  }
-
-  void render() {
-    shadowRoot.children = [];
-    if (_last == null) {
-      return;
-    }
-
-    shadowRoot.children = [
-      new NavTopMenuElement(last: last, queue: ObservatoryApplication.app.queue)
-        ..children = [new ContentElement()]
-    ];
-  }
-
-  bool _getBoolAttribute(String name) {
-    final String value = getAttribute(name);
-    return !(value == null || value == 'false');
-  }
-}