Revert "Parts must start with 'part of'" and "Attempt to fix VM build"

dart/tests/language/failing_main.dart

Index: dart/tests/language/failing_main.dart
diff --git a/dart/tests/language/failing_main.dart b/dart/tests/language/failing_main.dart
index d6b8492b956b9ea22606aeaf4d794f555626620b..3b922772f8560f4b8395bd0661845c40c3bd0c54 100644
--- a/dart/tests/language/failing_main.dart
+++ b/dart/tests/language/failing_main.dart
@@ -1,7 +1,6 @@
 // Copyright (c) 2011, 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.
-part of application_negative_test;
 
 main() {
   Expect.equals(true, false);