Omnibus Observatory UI fixes:

runtime/observatory/tests/observatory_ui/object_common/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/class_ref.dart';
 import 'package:observatory/src/elements/inbound_references.dart';
 import 'package:observatory/src/elements/object_common.dart';
 import 'package:observatory/src/elements/retaining_path.dart';
 import '../mocks.dart';
 
 main() {
   ObjectCommonElement.tag.ensureRegistration();
 
   final cTag = ClassRefElement.tag.name;
   final iTag = InboundReferencesElement.tag.name;
   final rTag = RetainingPathElement.tag.name;
 
   const isolate = const IsolateRefMock();
   const object = const InstanceMock();
   final reachableSizes = new ReachableSizeRepositoryMock();
   final retainedSizes = new RetainedSizeRepositoryMock();
   final inbounds = new InboundReferencesRepositoryMock();
   final paths = new RetainingPathRepositoryMock();
-  final instances = new InstanceRepositoryMock();
+  final objects = new ObjectRepositoryMock();
   test('instantiation', () {
     final e = new ObjectCommonElement(isolate, object, retainedSizes,
-        reachableSizes, inbounds, paths, instances);
+        reachableSizes, inbounds, paths, objects);
     expect(e, isNotNull, reason: 'element correctly created');
     expect(e.isolate, equals(isolate));
     expect(e.object, equals(object));
   });
   group('elements', () {
     test('created after attachment', () async {
       final e = new ObjectCommonElement(isolate, object, retainedSizes,
-          reachableSizes, inbounds, paths, instances);
+          reachableSizes, inbounds, paths, objects);
       document.body.append(e);
       await e.onRendered.first;
       expect(e.children.length, isNonZero, reason: 'has elements');
       expect(e.querySelectorAll(cTag).length, equals(1));
       expect(e.querySelectorAll(iTag).length, equals(1));
       expect(e.querySelectorAll(rTag).length, equals(1));
       e.remove();
       await e.onRendered.first;
       expect(e.children.length, isZero, reason: 'is empty');
     });
     test('created after attachment', () async {
       const value = const GuardedMock<InstanceMock>.fromValue(
           const InstanceMock(valueAsString: '10'));
       bool invoked = false;
       final reachableSizes = new ReachableSizeRepositoryMock(
           getter: expectAsync((i, id) async {
         expect(i, equals(isolate));
         expect(id, equals(object.id));
         invoked = true;
         return value;
       }, count: 1));
       final e = new ObjectCommonElement(isolate, object, retainedSizes,
-          reachableSizes, inbounds, paths, instances);
+          reachableSizes, inbounds, paths, objects);
       document.body.append(e);
       await e.onRendered.first;
       expect(invoked, isFalse);
       expect(e.children.length, isNonZero, reason: 'has elements');
       expect(e.querySelectorAll(cTag).length, equals(1));
       expect(e.querySelectorAll(iTag).length, equals(1));
       expect(e.querySelectorAll(rTag).length, equals(1));
       e.querySelector('.reachable_size').click();
       await e.onRendered.first;
       expect(invoked, isTrue);
       e.remove();
       await e.onRendered.first;
       expect(e.children.length, isZero, reason: 'is empty');
     });
     test('created after attachment', () async {
       const value = const GuardedMock<InstanceMock>.fromValue(
           const InstanceMock(valueAsString: '10'));
       bool invoked = false;
       final retainedSizes = new RetainedSizeRepositoryMock(
           getter: expectAsync((i, id) async {
         expect(i, equals(isolate));
         expect(id, equals(object.id));
         invoked = true;
         return value;
       }, count: 1));
       final e = new ObjectCommonElement(isolate, object, retainedSizes,
-          reachableSizes, inbounds, paths, instances);
+          reachableSizes, inbounds, paths, objects);
       document.body.append(e);
       await e.onRendered.first;
       expect(invoked, isFalse);
       expect(e.children.length, isNonZero, reason: 'has elements');
       expect(e.querySelectorAll(cTag).length, equals(1));
       expect(e.querySelectorAll(iTag).length, equals(1));
       expect(e.querySelectorAll(rTag).length, equals(1));
       e.querySelector('.retained_size').click();
       await e.onRendered.first;
       expect(invoked, isTrue);
       e.remove();
       await e.onRendered.first;
       expect(e.children.length, isZero, reason: 'is empty');
     });
   });
 }