Move kernel baseline tests to front_end.

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

Index: pkg/front_end/test/fasta/rasta/bad_unicode.dart
diff --git a/pkg/front_end/test/fasta/rasta/bad_unicode.dart b/pkg/front_end/test/fasta/rasta/bad_unicode.dart
deleted file mode 100644
index 51c6502f1ee859621bc99a07780fcf7665fddb8e..0000000000000000000000000000000000000000
--- a/pkg/front_end/test/fasta/rasta/bad_unicode.dart
+++ /dev/null
@@ -1,7 +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.
-
-main() {
-  print("\u00"); // Bad Unicode escape, must have 4 hex digits.
-}