Add constructors to all the event classes.

client/html/src/StorageEvent.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 StorageEvent extends Event factory StorageEventWrappingImplementation {
 
-interface StorageEvent extends Event {
+  StorageEvent(String type, String key, String url, Storage storageArea,
+      [bool canBubble, bool cancelable, String oldValue, String newValue]);
 
   String get key();
 
   String get newValue();
 
   String get oldValue();
 
   Storage get storageArea();
 
   String get url();
-
-  void initStorageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, String keyArg, String oldValueArg, String newValueArg, String urlArg, Storage storageAreaArg);
 }