Make TypedefMirror a direct descendant of TypeMirror.

tests/lib/mirrors/mirrors_test.dart

 // Copyright (c) 2011, 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.
 
 library MirrorsTest;
 
 import 'dart:mirrors';
 
 import '../../light_unittest.dart';
 
@@ skipping 234 matching lines @@
   if (!isDart2js) { // TODO(ahe): Implement this in dart2js.
     TypeVariableMirror typeVariable = classMirror.typeVariables.values.single;
     expect(typeVariable.simpleName, equals(const Symbol('T')));
     expect(typeVariable.qualifiedName,
            equals(const Symbol('MirrorsTest.Class.T')));
 
     expect(typedefMirror.simpleName, equals(const Symbol('Typedef')));
     expect(typedefMirror.qualifiedName,
            equals(const Symbol('MirrorsTest.Typedef')));
 
-    var typedefMirrorDeNovo = reflectClass(Typedef);
+    var typedefMirrorDeNovo = reflectType(Typedef);
     expect(typedefMirrorDeNovo.simpleName, equals(const Symbol('Typedef')));
     expect(typedefMirrorDeNovo.qualifiedName,
            equals(const Symbol('MirrorsTest.Typedef')));
   }
 
   expect(methodMirror.simpleName, equals(const Symbol('testNames')));
   expect(methodMirror.qualifiedName,
          equals(const Symbol('MirrorsTest.testNames')));
 
   expect(variableMirror.simpleName, equals(const Symbol('field')));
@@ skipping 19 matching lines @@
   test("Test current library uri", () {
     testLibraryUri(new Class(),
       (Uri uri) => uri.path.endsWith('/mirrors_test.dart'));
   });
   test("Test dart library uri", () {
     testLibraryUri("test", (Uri uri) => uri == Uri.parse('dart:core'));
   });
   test("Test simple and qualifiedName", () { testNames(mirrors); });
   test("Test reflect type", () { testReflectClass(mirrors); });
 }