Update the Angular/DI tests to latest from github.

third_party/pkg/angular/lib/mock/mock_window.dart

Index: third_party/pkg/angular/lib/mock/mock_window.dart
diff --git a/third_party/pkg/angular/lib/mock/mock_window.dart b/third_party/pkg/angular/lib/mock/mock_window.dart
index 90b7306e9912d1409689b0e1359060b8c3691639..7e7c4e928578716a43a13a0049d8b2752e3a5496 100644
--- a/third_party/pkg/angular/lib/mock/mock_window.dart
+++ b/third_party/pkg/angular/lib/mock/mock_window.dart
@@ -2,16 +2,13 @@ part of angular.mock;
 
 @proxy
 class MockWindow extends Mock implements Window {
-  MockHistory history = new MockHistory();
-  MockLocation location = new MockLocation();
-  MockDocument document = new MockDocument();
-
-  dart_async.StreamController<PopStateEvent> onPopStateController =
-      new dart_async.StreamController<PopStateEvent>();
-  dart_async.StreamController<Event> onHashChangeController =
-      new dart_async.StreamController<Event>();
-  dart_async.StreamController<MouseEvent> onClickController =
-      new dart_async.StreamController<MouseEvent>();
+  final history = new MockHistory();
+  final location = new MockLocation();
+  final document = new MockDocument();
+
+  final onPopStateController = new dart_async.StreamController<PopStateEvent>();
+  final onHashChangeController = new dart_async.StreamController<Event>();
+  final onClickController = new dart_async.StreamController<MouseEvent>();
 
 
   dart_async.Stream<PopStateEvent> get onPopState => onPopStateController.stream;