Update pubspecs and dependencies to get pkgbuild tests working.

third_party/pkg/angular/test/io/test_files/main.dart

-library test_files.main;
-
-import 'package:angular/core/module.dart';
-
-@NgDirective(
-    children: NgAnnotation.TRANSCLUDE_CHILDREN,
-    selector:'[ng-if]',
-    map: const {'.': '=>ngIfCondition'})
-class NgIfDirective {
-  bool ngIfCondition;
-}
-
-@NgComponent(
-    selector: 'my-component',
-    map: const {
-      'attr': '@attr',
-      'expr': '=>expr'
-    },
-    template: '<div>{{ctrl.inline.template.expression}}</div>',
-    exportExpressionAttrs: const ['exported-attr'],
-    exportExpressions: const ['exported + expression'])
-class MyComponent {
-  @NgOneWay('another-expression')
-  String anotherExpression;
-
-  @NgCallback('callback')
-  set callback(Function) {}
-
-  set twoWayStuff(String abc) {}
-  @NgTwoWay('two-way-stuff')
-  String get twoWayStuff => null;
-}
-
-class CssUrlsString {
-
-}
-
-class CssUrlsList {
-
-}