Refresh dart:dom libraries from WebKit

client/dom/generated/src/wrapping/_DataTransferItemListWrappingImplementation.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 _DataTransferItemListWrappingImplementation extends DOMWrapperBase implements DataTransferItemList {
   _DataTransferItemListWrappingImplementation() : super() {}
 
   static create__DataTransferItemListWrappingImplementation() native {
     return new _DataTransferItemListWrappingImplementation();
   }
 
   int get length() { return _get_length(this); }
   static int _get_length(var _this) native;
 
-  void add(String data, String type) {
-    _add(this, data, type);
-    return;
+  void add(var data_OR_file, [String type = null]) {
+    if (data_OR_file is File) {
+      if (type === null) {
+        _add(this, data_OR_file);
+        return;
+      }
+    } else {
+      if (data_OR_file is String) {
+        _add_2(this, data_OR_file, type);
+        return;
+      }
+    }
+    throw "Incorrect number or type of arguments";
   }
-  static void _add(receiver, data, type) native;
+  static void _add(receiver, data_OR_file) native;
+  static void _add_2(receiver, data_OR_file, type) native;
 
   void clear() {
     _clear(this);
     return;
   }
   static void _clear(receiver) native;
 
   DataTransferItem item(int index) {
     return _item(this, index);
   }
   static DataTransferItem _item(receiver, index) native;
 
   String get typeName() { return "DataTransferItemList"; }
 }