Omnibus Observatory UI fixes:

runtime/observatory/tests/observatory_ui/ports/element_test.dart

Index: runtime/observatory/tests/observatory_ui/ports/element_test.dart
diff --git a/runtime/observatory/tests/observatory_ui/ports/element_test.dart b/runtime/observatory/tests/observatory_ui/ports/element_test.dart
index 4b232b358417613c07863ce27c89e974d1306b04..54af9d2335542e5daec98f230fde98d0d7f20566 100644
--- a/runtime/observatory/tests/observatory_ui/ports/element_test.dart
+++ b/runtime/observatory/tests/observatory_ui/ports/element_test.dart
@@ -15,9 +15,9 @@ main() {
   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));
@@ -34,8 +34,8 @@ main() {
       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');