Get rid of a lot of () for getters.

lib/html/src/StorageEventWrappingImplementation.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 StorageEventWrappingImplementation extends EventWrappingImplementation implements StorageEvent {
   StorageEventWrappingImplementation._wrap(ptr) : super._wrap(ptr);
 
   factory StorageEventWrappingImplementation(String type, String key,
       String url, Storage storageArea, [bool canBubble = true,
       bool cancelable = true, String oldValue = null,
       String newValue = null]) {
     final e = dom.document.createEvent("StorageEvent");
     e.initStorageEvent(type, canBubble, cancelable, key, oldValue, newValue,
         url, LevelDom.unwrap(storageArea));
     return LevelDom.wrapStorageEvent(e);
   }
 
-  String get key() => _ptr.key;
+  String get key => _ptr.key;
 
-  String get newValue() => _ptr.newValue;
+  String get newValue => _ptr.newValue;
 
-  String get oldValue() => _ptr.oldValue;
+  String get oldValue => _ptr.oldValue;
 
-  Storage get storageArea() => LevelDom.wrapStorage(_ptr.storageArea);
+  Storage get storageArea => LevelDom.wrapStorage(_ptr.storageArea);
 
-  String get url() => _ptr.url;
+  String get url => _ptr.url;
 }