Add missing registration of throwRuntimeError.

tests/language/create_unresolved_type_test.dart

Index: tests/language/create_unresolved_type_test.dart
diff --git a/tests/language/extends_test_lib.dart b/tests/language/create_unresolved_type_test.dart
similarity index 76%
copy from tests/language/extends_test_lib.dart
copy to tests/language/create_unresolved_type_test.dart
index d62ca8f7da480b38ac34aed6411d25acba5ae339..ceaf6dc421edb871d8741f36f23b83b50c23a897 100644
--- a/tests/language/extends_test_lib.dart
+++ b/tests/language/create_unresolved_type_test.dart
@@ -2,8 +2,6 @@
 // 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 ExtendsTestLib;
-
-class A {
-  var y = "class A from library";
+main() {
+  new F<int>();  /// 01: runtime error, static type warning
 }