Correct and GC unrecognized flags from our tests.

runtime/observatory/tests/service/vm_restart_test.dart

Index: runtime/observatory/tests/service/vm_restart_test.dart
diff --git a/runtime/observatory/tests/service/vm_restart_test.dart b/runtime/observatory/tests/service/vm_restart_test.dart
index 605e7bfa9a327e9b740d860ad3f1a8e30d40b2f3..616831340af482c8bd93cef1a05cf7db9fadcdad 100644
--- a/runtime/observatory/tests/service/vm_restart_test.dart
+++ b/runtime/observatory/tests/service/vm_restart_test.dart
@@ -1,7 +1,7 @@
 // Copyright (c) 2015, 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
+// VMOptions=--compile_all --error_on_bad_type --error_on_bad_override
 
 import 'dart:async';
 import 'dart:developer';