Add constructors to all the event classes.

client/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.
 
-// WARNING: Do not edit - generated code.
-
 class StorageEventWrappingImplementation extends EventWrappingImplementation implements StorageEvent {
   StorageEventWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
+  factory StorageEventWrappingImplementation(String type, String key,
+      String url, Storage storageArea, [bool canBubble = false,
+      bool cancelable = false, String oldValue = null,
+      String newValue = null]) {
+    var e = dom.document.createEvent("StorageEvent");
+    e.initStorageEvent(type, canBubble, cancelable, key, oldValue, newValue,
+        url, LevelDom.unwrap(storageArea));
+    return LevelDom.wrapStorageEvent(e);
+  }
+
   String get key() { return _ptr.key; }
 
   String get newValue() { return _ptr.newValue; }
 
   String get oldValue() { return _ptr.oldValue; }
 
   Storage get storageArea() { return LevelDom.wrapStorage(_ptr.storageArea); }
 
   String get url() { return _ptr.url; }
-
-  void initStorageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, String keyArg, String oldValueArg, String newValueArg, String urlArg, Storage storageAreaArg) {
-    _ptr.initStorageEvent(typeArg, canBubbleArg, cancelableArg, keyArg, oldValueArg, newValueArg, urlArg, LevelDom.unwrap(storageAreaArg));
-    return;
-  }
 }