Move kernel baseline tests to front_end.

pkg/front_end/testcases/rasta/issue_000044.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.
 
 // Parse error: but the parser should recover and create something that looks
 // like `a b(c) => d`.
 a b(c) = d;
 
 class C {
   // Good constructor.
@@ skipping 10 matching lines @@
   C notEvenAConstructor(a) = h;
 }
 
 main() {
   C c = null;
   print(const C.constant());
   print(const C.missingFactoryKeyword());
   print(const C.good());
   print(new C.constant().notEvenAConstructor(null));
 }