Reject deprecated language features.

dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart

Index: dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart b/dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
index 28a38f9e1bba5586408bedef19449a7600d43178..9c2e77e0afbd2760f1790792b5a43004acbe6218 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
@@ -2,15 +2,15 @@
 // 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('dart:_js_helper');
+library _js_helper;
 
-#import('dart:collection');
+import 'dart:collection';
 
-#source('constant_map.dart');
-#source('native_helper.dart');
-#source('regexp_helper.dart');
-#source('string_helper.dart');
-#source('mirror_opt_in_message.dart');
+part 'constant_map.dart';
+part 'native_helper.dart';
+part 'regexp_helper.dart';
+part 'string_helper.dart';
+part 'mirror_opt_in_message.dart';
 
 // Performance critical helper methods.
 add(var a, var b) => (a is num && b is num)