Omnibus Observatory UI fixes:

runtime/observatory/tests/observatory_ui/ports/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/ports.dart';
 import '../mocks.dart';
 
 main() {
   PortsElement.tag.ensureRegistration();
 
   const vm = const VMMock();
   const isolate = const IsolateRefMock();
   final events = new EventRepositoryMock();
   final notifs = new NotificationRepositoryMock();
   final ports = new PortsRepositoryMock();
-  final instances = new InstanceRepositoryMock();
+  final objects = new ObjectRepositoryMock();
   test('instantiation', () {
-    final e = new PortsElement(vm, isolate, events, notifs, ports, instances);
+    final e = new PortsElement(vm, isolate, events, notifs, ports, objects);
     expect(e, isNotNull, reason: 'element correctly created');
     expect(e.isolate, equals(isolate));
     expect(e.ports, equals(ports));
   });
   test('elements created after attachment', () async {
     const elements = const [
       const PortMock(name: 'port-1'),
       const PortMock(name: 'port-2'),
       const PortMock(name: 'port-3')
     ];
     const isolatePorts = const PortsMock(elements: elements);
     final ports = new PortsRepositoryMock(
         getter: expectAsync((i) async {
       expect(i, equals(isolate));
       return isolatePorts;
     }, count: 1));
-    final instances = new InstanceRepositoryMock();
-    final e = new PortsElement(vm, isolate, events, notifs, ports, instances);
+    final objects = new ObjectRepositoryMock();
+    final e = new PortsElement(vm, isolate, events, notifs, ports, objects);
     document.body.append(e);
     await e.onRendered.first;
     expect(e.children.length, isNonZero, reason: 'has elements');
     expect(e.querySelectorAll('.port-number').length, equals(elements.length));
     e.remove();
     await e.onRendered.first;
     expect(e.children.length, isZero, reason: 'is empty');
   });
 }