Enable strict flags for all service tests

runtime/observatory/test/malformed_test.dart

Index: runtime/observatory/test/malformed_test.dart
diff --git a/runtime/observatory/test/malformed_test.dart b/runtime/observatory/test/malformed_test.dart
index 76fffb4773d9b797a71ce566780ef7b24544325b..989457d41839156548f5e67c74f00f1924db141b 100644
--- a/runtime/observatory/test/malformed_test.dart
+++ b/runtime/observatory/test/malformed_test.dart
@@ -1,6 +1,7 @@
 // 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.
+// VMOptions=--compile-all --error_on_bad_type --error_on_bad_override --checked
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';