Revert two Kernel changes that were causing test failures.

tests/language_strong/assign_instance_method_negative_test.dart

Index: tests/language_strong/assign_instance_method_negative_test.dart
diff --git a/tests/language_2/assign_instance_method_test.dart b/tests/language_strong/assign_instance_method_negative_test.dart
similarity index 61%
rename from tests/language_2/assign_instance_method_test.dart
rename to tests/language_strong/assign_instance_method_negative_test.dart
index 0b4fa3583615346441b47f3302399abd1219b198..0e17f16aa7dccb8405498341fa6dc6c586f8ad3c 100644
--- a/tests/language_2/assign_instance_method_test.dart
+++ b/tests/language_strong/assign_instance_method_negative_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.
 
-import 'package:expect/expect.dart';
-
 class A {
   A() {}
   imethod() {
@@ -12,12 +10,9 @@ class A {
 }
 
 main() {
-  dynamic a = new A();
-
-  // Illegal, can't change a member method.
-  Expect.throws(() {
-    a.imethod = () {
-      return 1;
-    };
-  });
+  var a = new A();
+  // Illegal, can't change a member method
+  a.imethod = () {
+    return 1;
+  };
 }