Removed polymer & mirror from Observatory

runtime/observatory/tests/observatory_ui/nav/isolate-menu/element_test.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:unittest/unittest.dart';
-import 'package:observatory/src/elements/nav/menu.dart';
 import 'package:observatory/src/elements/nav/isolate_menu.dart';
 import '../../mocks.dart';
 
 main() {
   NavIsolateMenuElement.tag.ensureRegistration();
 
-  final tag = NavMenuElement.tag.name;
+  final tag = '.nav-menu_label > a';
 
   EventRepositoryMock events;
   final ref = const IsolateRefMock(id: 'i-id', name: 'old-name');
   final obj = const IsolateMock(id: 'i-id', name: 'new-name');
   setUp(() {
     events = new EventRepositoryMock();
   });
   group('instantiation', () {
     test('IsolateRef', () {
       final e = new NavIsolateMenuElement(ref, events);
       expect(e, isNotNull, reason: 'element correctly created');
       expect(e.isolate, equals(ref));
     });
     test('Isolate', () {
       final e = new NavIsolateMenuElement(obj, events);
       expect(e, isNotNull, reason: 'element correctly created');
       expect(e.isolate, equals(obj));
     });
   });
   test('elements created after attachment', () async {
     final e = new NavIsolateMenuElement(ref, events);
     document.body.append(e);
     await e.onRendered.first;
-    expect(e.shadowRoot.children.length, isNonZero, reason: 'has elements');
+    expect(e.children.length, isNonZero, reason: 'has elements');
     e.remove();
     await e.onRendered.first;
-    expect(e.shadowRoot.children.length, isZero, reason: 'is empty');
+    expect(e.children.length, isZero, reason: 'is empty');
   });
   group('updates', () {
     test('are correctly listen', () async {
       final e = new NavIsolateMenuElement(ref, events);
       expect(events.onIsolateUpdateHasListener, isFalse);
       document.body.append(e);
       await e.onRendered.first;
       expect(events.onIsolateUpdateHasListener, isTrue);
       e.remove();
       await e.onRendered.first;
       expect(events.onIsolateUpdateHasListener, isFalse);
     });
     test('have effects', () async {
       final e = new NavIsolateMenuElement(ref, events);
       document.body.append(e);
       await e.onRendered.first;
-      expect((e.shadowRoot.querySelector(tag) as NavMenuElement)
-             .label.contains(ref.name), isTrue);
+      expect(e.querySelector(tag).text.contains(ref.name), isTrue);
       events.add(new IsolateUpdateEventMock(isolate: obj));
       await e.onRendered.first;
-      expect((e.shadowRoot.querySelector(tag) as NavMenuElement)
-             .label.contains(ref.name), isFalse);
-      expect((e.shadowRoot.querySelector(tag) as NavMenuElement)
-            .label.contains(obj.name), isTrue);
+      expect(e.querySelector(tag).text.contains(ref.name), isFalse);
+      expect(e.querySelector(tag).text.contains(obj.name), isTrue);
       e.remove();
     });
   });
 }