Improve frog error reporting when providing too few or too many arguments.

tests/language/src/PrivateFactoryResolutionNegativeTest.dart

Index: tests/language/src/PrivateFactoryResolutionNegativeTest.dart
diff --git a/tests/language/src/PrivateFactoryResolutionNegativeTest.dart b/tests/language/src/PrivateFactoryResolutionNegativeTest.dart
index 92b07c99ab28cf7eadf8b147f7fa39f0522cb2bb..d7db72784c2376c429de451ae7f4e861e2c8666c 100644
--- a/tests/language/src/PrivateFactoryResolutionNegativeTest.dart
+++ b/tests/language/src/PrivateFactoryResolutionNegativeTest.dart
@@ -2,7 +2,7 @@
 // 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.
 
-class PrivateFactoryResolutionTest {
+class PrivateFactoryResolutionNegativeTest {
 
   static testMain() {
     new TypeError._uninstantiable();