Move kernel baseline tests to front_end.

pkg/front_end/testcases/rasta/generic_factory.dart

 // Copyright (c) 2016, 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.md file.
 
 class C1 {
 }
 
 class C2 {
 }
 
@@ skipping 21 matching lines @@
       : super.internal();
 }
 
 main() {
   new A<C3>.a();
   new A<C3>.b();
   new B<C3>.a();
   new B<C3>.b();
   new A<C3>.c();
 }