Removed polymer & mirror from Observatory

runtime/observatory/tests/observatory_ui/nav/vm_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/menu_item.dart';
 import 'package:observatory/src/elements/nav/vm_menu.dart';
 import '../../mocks.dart';
 
 main(){
   NavVMMenuElement.tag.ensureRegistration();
 
-  final mTag = NavMenuElement.tag.name;
+  final mTag = '.nav-menu_label > a';
   final miTag = NavMenuItemElement.tag.name;
 
   EventRepositoryMock events;
   final vm1 = const VMMock(name: 'vm-name-1', displayName: 'display-name-1',
       isolates: const [const IsolateRefMock(id: 'i-id-1', name: 'i-name-1')]);
   final vm2 = const VMMock(name: 'vm-name-2', displayName: 'display-name-2',
       isolates: const [const IsolateRefMock(id: 'i-id-1', name: 'i-name-1'),
                        const IsolateRefMock(id: 'i-id-2', name: 'i-name-2')]);
   setUp(() {
     events = new EventRepositoryMock();
   });
   test('instantiation', () {
     final e = new NavVMMenuElement(vm1, events);
     expect(e, isNotNull, reason: 'element correctly created');
     expect(e.vm, equals(vm1));
   });
   test('elements created after attachment', () async {
     final e = new NavVMMenuElement(vm1, 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 NavVMMenuElement(vm1, events);
       expect(events.onVMUpdateHasListener, isFalse);
       document.body.append(e);
       await e.onRendered.first;
       expect(events.onVMUpdateHasListener, isTrue);
       e.remove();
       await e.onRendered.first;
       expect(events.onVMUpdateHasListener, isFalse);
     });
     test('have effects', () async {
       final e = new NavVMMenuElement(vm1, events);
       document.body.append(e);
       await e.onRendered.first;
-      expect((e.shadowRoot.querySelector(mTag) as NavMenuElement).label,
-          equals(vm1.displayName));
-      expect(e.shadowRoot.querySelectorAll(miTag).length,
+      expect(e.querySelectorAll(mTag).single.text, equals(vm1.displayName));
+      expect(e.querySelectorAll(miTag).length,
           equals(vm1.isolates.length));
       events.add(new VMUpdateEventMock(vm: vm2));
       await e.onRendered.first;
-      expect((e.shadowRoot.querySelector(mTag) as NavMenuElement).label,
-          equals(vm2.displayName));
-      expect(e.shadowRoot.querySelectorAll(miTag).length,
+      expect(e.querySelectorAll(mTag).single.text, equals(vm2.displayName));
+      expect(e.querySelectorAll(miTag).length,
           equals(vm2.isolates.length));
       e.remove();
     });
   });
 }