Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/rasta/issue_000007.dart

Index: pkg/front_end/test/fasta/rasta/issue_000007.dart
diff --git a/pkg/front_end/test/fasta/rasta/issue_000007.dart b/pkg/front_end/test/fasta/rasta/issue_000007.dart
deleted file mode 100644
index 7553185d610fd9837b32c34d67309dfc96519162..0000000000000000000000000000000000000000
--- a/pkg/front_end/test/fasta/rasta/issue_000007.dart
+++ /dev/null
@@ -1,13 +0,0 @@
-// 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 Base {}
-class Mixin {
-  foo() => print('foo');
-}
-class Sub extends Base with Mixin {}
-
-main() {
-  new Sub().foo();
-}