New version of dart:html

client/html/src/WindowWrappingImplementation.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.
 
 // TODO(jacobr): define a base class containing the overlap between
 // this class and ElementEvents.
 class WindowEventsImplementation extends EventsImplementation
       implements WindowEvents {
   WindowEventsImplementation._wrap(_ptr) : super._wrap(_ptr);
 
@@ skipping 815 matching lines @@
       if (p === null) {
         return LevelDom.wrapPoint(_ptr.webkitConvertPointFromPageToNode(LevelDom.unwrap(node)));
       } else {
         return LevelDom.wrapPoint(_ptr.webkitConvertPointFromPageToNode(LevelDom.unwrap(node), LevelDom.unwrap(p)));
       }
     }
     throw "Incorrect number or type of arguments";
   }
 
   int webkitRequestAnimationFrame(RequestAnimationFrameCallback callback, [Element element = null]) {
-    if (element === null) {
-      return _ptr.webkitRequestAnimationFrame(callback);
-    } else {
-      return _ptr.webkitRequestAnimationFrame(
-          callback, LevelDom.unwrap(element));
-    }
+    return _ptr.webkitRequestAnimationFrame(callback, LevelDom.unwrap(element));
   }
 
   void requestLayoutFrame(TimeoutHandler callback) {
     _addMeasurementFrameCallback(callback);
   }
 
   WindowEvents get on() {
     if (_on === null) {
       _on = new WindowEventsImplementation._wrap(_ptr);
     }
     return _on;
   }
 }