Use 'field' syntax in dart:dom interfaces.

client/dom/generated/src/interface/ValidityState.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 ValidityState {
 
-  bool get customError();
+  final bool customError;
 
-  bool get patternMismatch();
+  final bool patternMismatch;
 
-  bool get rangeOverflow();
+  final bool rangeOverflow;
 
-  bool get rangeUnderflow();
+  final bool rangeUnderflow;
 
-  bool get stepMismatch();
+  final bool stepMismatch;
 
-  bool get tooLong();
+  final bool tooLong;
 
-  bool get typeMismatch();
+  final bool typeMismatch;
 
-  bool get valid();
+  final bool valid;
 
-  bool get valueMissing();
+  final bool valueMissing;
 }