remove smoke from the repo

pkg/smoke/test/mirrors_used_test.dart

Index: pkg/smoke/test/mirrors_used_test.dart
diff --git a/pkg/smoke/test/mirrors_used_test.dart b/pkg/smoke/test/mirrors_used_test.dart
deleted file mode 100644
index 11c3bf30e839f6977133479034a2692a3c5a56fe..0000000000000000000000000000000000000000
--- a/pkg/smoke/test/mirrors_used_test.dart
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright (c) 2014, 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 file.
-
-library smoke.test.mirrors_test;
-
-import 'package:smoke/mirrors.dart';
-import 'package:unittest/unittest.dart';
-import 'common.dart' hide main;
-import 'common.dart' as common show main;
-
-
-@MirrorsUsed(
-    targets: const [A, B, C, D, E, E2, F, F2, G, H, Type],
-    override: 'smoke.mirrors')
-import 'dart:mirrors';
-
-main() {
-  setUp(useMirrors);
-  common.main();
-}