Update mirror tests to new mixin application syntax.

tests/lib/mirrors/mixin_application_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // This test uses the multi-test "ok" feature to create two positive tests from
 // one file. One of these tests fail on dart2js, but pass on the VM, or vice
 // versa.
 // TODO(ahe): When both implementations agree, remove the multi-test parts.
 
 library test.mixin_application_test;
 
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
 
 import 'model.dart';
 import 'stringify.dart';
 
 class Mixin {
   int i;
   m() {}
 }
 
 class Mixin2 {
   int i2;
   m2() {}
 }
 
-typedef MixinApplication = C with Mixin;
-typedef MixinApplicationA = C with Mixin, Mixin2;
+class MixinApplication = C with Mixin;
+class MixinApplicationA = C with Mixin, Mixin2;
 
-typedef UnusedMixinApplication = C with Mixin;
+class UnusedMixinApplication = C with Mixin;
 
 class Subclass extends C with Mixin {
   f() {}
 }
 
 class Subclass2 extends MixinApplication {
   g() {}
 }
 
 class SubclassA extends C with Mixin, Mixin2 {
@@ skipping 290 matching lines @@
   testMixin();
   testMixin2();
   testMixinApplication();
   testMixinApplicationA();
   testUnusedMixinApplication();
   testSubclass();
   testSubclass2();
   testSubclassA();
   testSubclass2A();
 }