Revert r13127.

lib/html/dartium/html_dartium.dart

Index: lib/html/dartium/html_dartium.dart
===================================================================
--- lib/html/dartium/html_dartium.dart	(revision 13128)
+++ lib/html/dartium/html_dartium.dart	(working copy)
@@ -9386,16 +9386,11 @@
 /// @domName CustomEvent
 abstract class CustomEvent implements Event {
 
-  factory CustomEvent(String type, [bool canBubble = true, bool cancelable = true,
-      Object detail = null]) => _CustomEventFactoryProvider.createCustomEvent(type, canBubble,
-      cancelable, detail);
-
-
   /** @domName CustomEvent.detail */
   abstract Object get detail;
 
   /** @domName CustomEvent.initCustomEvent */
-  void $dom_initCustomEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object detailArg);
+  void initCustomEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object detailArg);
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
@@ -9407,7 +9402,7 @@
 
   Object get detail native "CustomEvent_detail_Getter";
 
-  void $dom_initCustomEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object detailArg) native "CustomEvent_initCustomEvent_Callback";
+  void initCustomEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object detailArg) native "CustomEvent_initCustomEvent_Callback";
 
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
@@ -42948,15 +42943,6 @@
 // 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 _CustomEventFactoryProvider {
-  static CustomEvent createCustomEvent(String type, [bool canBubble = true,
-      bool cancelable = true, Object detail = null]) {
-    final _CustomEventImpl e = _document.$dom_createEvent("CustomEvent");
-    e.$dom_initCustomEvent(type, canBubble, cancelable, detail);
-    return e;
-  }
-}
-
 class _EventFactoryProvider {
   static Event createEvent(String type, [bool canBubble = true,
       bool cancelable = true]) {
@@ -42965,7 +42951,7 @@
     return e;
   }
 }
- 
+
 class _MouseEventFactoryProvider {
   static MouseEvent createMouseEvent(String type, Window view, int detail,
       int screenX, int screenY, int clientX, int clientY, int button,