Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/rasta/issue_000031.dart

Index: pkg/front_end/test/fasta/rasta/issue_000031.dart
diff --git a/pkg/front_end/test/fasta/rasta/issue_000031.dart b/pkg/front_end/test/fasta/rasta/issue_000031.dart
deleted file mode 100644
index 9f6f91a84e441d7d531229f5f32164fad4ecaef1..0000000000000000000000000000000000000000
--- a/pkg/front_end/test/fasta/rasta/issue_000031.dart
+++ /dev/null
@@ -1,9 +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.
-
-import 'dart:math' as math;
-
-main() {
-  math..toString();
-}