Revert two Kernel changes that were causing test failures.

tests/language/assign_to_type_test.dart

Index: tests/language/assign_to_type_test.dart
diff --git a/tests/language/assign_to_type_test.dart b/tests/language/assign_to_type_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7ecd74b09f43a922cba5e763a0a482236fc013f2
--- /dev/null
+++ b/tests/language/assign_to_type_test.dart
@@ -0,0 +1,29 @@
+// Copyright (c) 2015, 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.
+
+// Verify that an attempt to assign to a class, enum, typedef, or type
+// parameter produces a static warning and runtime error.
+
+import "package:expect/expect.dart";
+
+noMethod(e) => e is NoSuchMethodError;
+
+class C<T> {
+  f() {
+    Expect.throws(() => T = null, noMethod); //# 01: static type warning
+  }
+}
+
+class D {}
+
+enum E { e0 }
+
+typedef void F();
+
+main() {
+  new C<D>().f();
+  Expect.throws(() => D = null, noMethod); //# 02: static type warning
+  Expect.throws(() => E = null, noMethod); //# 03: static type warning
+  Expect.throws(() => F = null, noMethod); //# 04: static type warning
+}