Update all Angular libs (run update_all.sh).

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

-part of angular.directive;
-
-/**
- * @ngdoc directive
- * @name ng.directive:a
- * @restrict E
- *
- * @description
- * Modifies the default behavior of the html A tag so that the default action is prevented when
- * the a href is empty or it contains `ng-click` directive.
- *
- * This change permits the easy creation of action links with the `ngClick` directive
- * without changing the location or causing page reloads, e.g.:
- * `<a href="" ng-click="model.$save()">Save</a>`
- */
-@NgDirective(selector: 'a[href]')
-class NgADirective {
-  final dom.Element element;
-
-  NgADirective(this.element) {
-    if (element.attributes["href"] == "" ||
-        element.attributes.containsKey('ng-click')) {
-      element.onClick.listen((event) {
-        if (element.attributes["href"] == "") {
-          event.preventDefault();
-        }
-      });
-    }
-  }
-}