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

dart/lib/compiler/implementation/enqueue.dart

Index: dart/lib/compiler/implementation/enqueue.dart
diff --git a/dart/lib/compiler/implementation/enqueue.dart b/dart/lib/compiler/implementation/enqueue.dart
index 3cc125c9ede0c1d38e0139a16765ff91f0f8a8e6..0e97273d4f827585537d6668d78255c2602422ba 100644
--- a/dart/lib/compiler/implementation/enqueue.dart
+++ b/dart/lib/compiler/implementation/enqueue.dart
@@ -2,8 +2,6 @@
 // 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 dart2js;
-
 class EnqueueTask extends CompilerTask {
   final Enqueuer codegen;
   final Enqueuer resolution;