Update the Angular/DI tests to latest from github.

third_party/pkg/angular/lib/directive/ng_show_hide.dart

Index: third_party/pkg/angular/lib/directive/ng_show_hide.dart
diff --git a/third_party/pkg/angular/lib/directive/ng_show_hide.dart b/third_party/pkg/angular/lib/directive/ng_show_hide.dart
index af9b4581e543b6b9e02c073919e1bda922a4ef01..560cfce76434ca8ddd27bc83536638468104f12c 100644
--- a/third_party/pkg/angular/lib/directive/ng_show_hide.dart
+++ b/third_party/pkg/angular/lib/directive/ng_show_hide.dart
@@ -7,11 +7,11 @@ part of angular.directive;
  */
 @NgDirective(
     selector: '[ng-hide]',
-    map: const {'ng-hide': '=>hide'} )
+    map: const {'ng-hide': '=>hide'})
 class NgHideDirective {
   static String NG_HIDE_CLASS = 'ng-hide';
 
-  dom.Element element;
+  final dom.Element element;
 
   NgHideDirective(this.element);
 
@@ -33,17 +33,15 @@ class NgHideDirective {
     selector: '[ng-show]',
     map: const {'ng-show': '=>show'})
 class NgShowDirective {
-  static String NG_SHOW_CLASS = 'ng-show';
-
-  dom.Element element;
+  final dom.Element element;
 
   NgShowDirective(this.element);
 
   set show(value) {
     if (toBool(value)) {
-      element.classes.add(NG_SHOW_CLASS);
+      element.classes.remove(NgHideDirective.NG_HIDE_CLASS);
     } else {
-      element.classes.remove(NG_SHOW_CLASS);
+      element.classes.add(NgHideDirective.NG_HIDE_CLASS);
     }
   }
 }