New version of dart:html

client/html/generated/src/wrapping/_DataTransferItemWrappingImplementation.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.
 
 // WARNING: Do not edit - generated code.
 
 class DataTransferItemWrappingImplementation extends DOMWrapperBase implements DataTransferItem {
   DataTransferItemWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
   String get kind() { return _ptr.kind; }
 
   String get type() { return _ptr.type; }
 
   Blob getAsFile() {
     return LevelDom.wrapBlob(_ptr.getAsFile());
   }
 
   void getAsString(StringCallback callback) {
-    _ptr.getAsString(LevelDom.unwrap(callback));
+    _ptr.getAsString(callback);
     return;
   }
 }