Re-triage mirror test failures on the analyzer.

tests/lib/mirrors/reflect_class_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.
 
 import "dart:mirrors";
 
 import "package:expect/expect.dart";
 
 typedef void FooFunction(int a, double b);
 
 main() {
   Function expectedError = (e) => e is ArgumentError || e is TypeError;
 
   Expect.throws(() => reflectClass(dynamic), expectedError);
   Expect.throws(() => reflectClass(1), expectedError);
   Expect.throws(() => reflectClass("string"), expectedError);
-
-  // reflectClass() on a function type should fail once typedefs are represented
-  // by TypedefMirrors instead of ClassMirrors.
-  // Expect.throws(() => reflectClass(FooFunction), expectedError);
+  Expect.throws(() => reflectClass(FooFunction), expectedError);
 }