Resubmit fix for Function::Clone() and Field::Clone() to adjust the class owner

tests/language/mixin_type_parameter6_test.dart

Index: tests/language/mixin_type_parameter6_test.dart
===================================================================
--- tests/language/mixin_type_parameter6_test.dart	(revision 0)
+++ tests/language/mixin_type_parameter6_test.dart	(working copy)
@@ -0,0 +1,17 @@
+// 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.
+
+class A<T> {}
+
+class B<S> {
+  int foo(S s) => null;
+}
+
+class C extends A<int> with B<String> {}
+
+main() {
+  var list = <String>['foo'];
+  var c = new C();
+  list.map(c.foo);
+}