| Index: lib/compiler/implementation/lib/js_helper.dart | 
| diff --git a/lib/compiler/implementation/lib/js_helper.dart b/lib/compiler/implementation/lib/js_helper.dart | 
| index e5476d45799af63c012c1651b46f318d88efaabe..5a180261b0950696b593ad5977f178849fb3a358 100644 | 
| --- a/lib/compiler/implementation/lib/js_helper.dart | 
| +++ b/lib/compiler/implementation/lib/js_helper.dart | 
| @@ -632,7 +632,7 @@ class Primitives { | 
| if (namedArguments != null && !namedArguments.isEmpty) { | 
| // Call new List.from to make sure we get a JavaScript array. | 
| List<String> listOfNamedArguments = | 
| -          new List<String>.from(namedArguments.getKeys()); | 
| +          new List<String>.from(namedArguments.keys); | 
| argumentCount += namedArguments.length; | 
| // We're sorting on strings, and the behavior is the same between | 
| // Dart string sort and JS string sort. To avoid needing the Dart | 
|  |