Use method registration approach for creating events on core and modules.

Source/modules/InitModules.cpp

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "InitModules.h"
 
 #include "EventModulesFactory.h"
 #include "EventModulesNames.h"
 #include "EventTargetModulesNames.h"
 #include "EventTypeNames.h"
 #include "core/dom/Document.h"
 
 namespace WebCore {
 
 void ModulesInitializer::initEventNames()
 {
     EventNames::init();
     EventNames::initModules();
 }
 
 void ModulesInitializer::initEventTargetNames()
 {
     EventTargetNames::init();
     EventTargetNames::initModules();
 }
 
-PassRefPtrWillBeRawPtr<Event> createEventModules(const String& eventType, ExceptionState& exceptionState)
+void ModulesInitializer::registerEventFactory()
 {
-    RefPtrWillBeRawPtr<Event> event = EventModulesFactory::create(eventType);
-    if (event)
-        return event.release();
-
-    return Document::createEvent(eventType, exceptionState);
+    CoreInitializer::registerEventFactory();
+    Document::registerEventFactory(new EventModulesFactory());
 }
 
 } // namespace WebCore