Get rid of a lot of () for getters.

lib/html/src/HashChangeEventWrappingImplementation.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.
 
 class HashChangeEventWrappingImplementation extends EventWrappingImplementation implements HashChangeEvent {
   HashChangeEventWrappingImplementation._wrap(ptr) : super._wrap(ptr);
 
   factory HashChangeEventWrappingImplementation(String type, String oldURL,
       String newURL, [bool canBubble = true, bool cancelable = true]) {
     final e = dom.document.createEvent("HashChangeEvent");
     e.initHashChangeEvent(type, canBubble, cancelable, oldURL, newURL);
     return LevelDom.wrapHashChangeEvent(e);
   }
 
-  String get newURL() => _ptr.newURL;
+  String get newURL => _ptr.newURL;
 
-  String get oldURL() => _ptr.oldURL;
+  String get oldURL => _ptr.oldURL;
 }