Revert "Constrain type annotations with deferred types."

tests/language/deferred_prefix_constraints_lib2.dart

Index: tests/language/deferred_prefix_constraints_lib2.dart
diff --git a/tests/language/deferred_prefix_constraints_lib2.dart b/tests/language/deferred_prefix_constraints_lib2.dart
deleted file mode 100644
index c79d4e536005a5d128947c9557ef22fe463bec80..0000000000000000000000000000000000000000
--- a/tests/language/deferred_prefix_constraints_lib2.dart
+++ /dev/null
@@ -1,5 +0,0 @@
-// Copyright (c) 2014, 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.
-
-foo() => 24;