Removed dynamic Symbol creation and marked Bindable classes

runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart

Index: runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart
diff --git a/runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart b/runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart
index d1e56ace7a92abd0904f31565db793b777033afb..35fc44896ed27000f8334f53878612dc4b85adaa 100644
--- a/runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart
+++ b/runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart
@@ -10,9 +10,11 @@ import 'package:observatory/src/elements/helpers/tag.dart';
 import 'package:observatory/src/elements/shims/binding.dart';
 import 'package:observatory/src/elements/nav/class_menu.dart';
 
+@bindable
 class NavClassMenuElementWrapper extends HtmlElement {
-  static final binder = new Binder<NavClassMenuElementWrapper>(
-    const [const Binding('last'), const Binding('cls')]);
+  static const binder = const Binder<NavClassMenuElementWrapper>(const {
+      'last': #last, 'cls': #cls
+    });
 
   static const tag =
     const Tag<NavClassMenuElementWrapper>('class-nav-menu');