Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/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 {
-}
-
-class C3 {
-}
-
-class A<T> {
-  A.internal();
-
-  factory A.a() = B<T>.a;
-  factory A.b() = B<C1>.a;
-  factory A.c() = Missing;
-}
-
-class B<S> extends A<S> {
-  B.internal()
-      : super.internal();
-
-  factory B.a() = C<S>;
-  factory B.b() = C<C2>;
-}
-
-class C<U> extends B<U> {
-  C()
-      : super.internal();
-}
-
-main() {
-  new A<C3>.a();
-  new A<C3>.b();
-  new B<C3>.a();
-  new B<C3>.b();
-  new A<C3>.c();
-}