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

dart/tests/language/prefix12_test.dart

 // 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.
 //
 
-library Prefix12Test;
-import "library11.dart" as lib11;
+#library("Prefix12Test.dart");
+#import("library11.dart", prefix : "lib11");
 
 class Prefix12Test {
   static Test1() {
     var result = 0;
     var obj = new lib11.Library11.namedConstructor(10);
     result = obj.fld;
     Expect.equals(10, result);
   }
   static Test2() {
     int result = 0;
     var obj = new lib11.Library111<int>.namedConstructor(10);
     result = obj.fld;
     Expect.equals(10, result);
   }
 }
 
 main() {
   Prefix12Test.Test1();
   Prefix12Test.Test2();
 }