Converted Observatory refs elements

runtime/observatory/tests/observatory_ui/icdata_ref/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/instance_ref.dart';
 import '../mocks.dart';
 
 main() {
-  ClassRefElement.tag.ensureRegistration();
+  InstanceRefElement.tag.ensureRegistration();
 
   const isolate = const IsolateRefMock();
-  const cls = const ClassRefMock();
+  const instance = const InstanceRefMock();
+  final repository = new InstanceRepositoryMock();
   test('instantiation', () {
-    final e = new ClassRefElement(isolate, cls);
+    final e = new InstanceRefElement(isolate, instance, repository);
     expect(e, isNotNull, reason: 'element correctly created');
     expect(e.isolate, equals(isolate));
-    expect(e.cls, equals(cls));
+    expect(e.instance, equals(instance));
   });
   test('elements created after attachment', () async {
-    final e = new ClassRefElement(isolate, cls);
+    final e = new InstanceRefElement(isolate, instance, repository);
     document.body.append(e);
     await e.onRendered.first;
     expect(e.children.length, isNonZero, reason: 'has elements');
     e.remove();
     await e.onRendered.first;
     expect(e.children.length, isZero, reason: 'is empty');
   });
 }