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

dart/tests/language/prefix17_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 Prefix17Test;
-import "library12.dart" as lib12;
+#library("Prefix17Test.dart");
+#import("library12.dart", prefix:"lib12");
 
 class LocalClass {
   static int static_fld;
 }
 
 void main() {
   LocalClass.static_fld = 42;
   var lc1 = new lib12.Library12(5);
   lib12.Library12 lc2 = new lib12.Library12(10);
   lib12.Library12 lc2m = new lib12.Library12.other(10,2);
   lib12.Library12.static_fld = 43;
   //print("${LocalClass.static_fld}, ${lc1.fld}, ${lc2.fld}, ${lc2m.fld}, ${lib12.Library12.static_fld}");
 }