Use 'field' syntax in dart:dom interfaces.

client/dom/generated/src/interface/File.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.
 
 interface File extends Blob {
 
-  String get fileName();
+  final String fileName;
 
-  int get fileSize();
+  final int fileSize;
 
-  Date get lastModifiedDate();
+  final Date lastModifiedDate;
 
-  String get name();
+  final String name;
 
-  String get webkitRelativePath();
+  final String webkitRelativePath;
 }