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

Source/modules/EventModulesFactory.h

 // 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.
 
 #ifndef EventModulesFactory_h
 #define EventModulesFactory_h
 
+#include "core/events/EventFactory.h"
 #include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 class Event;
 
-class EventModulesFactory {
+class EventModulesFactory : public EventFactoryBase {
 public:
-    static PassRefPtrWillBeRawPtr<Event> create(const String& eventType);
+    virtual PassRefPtrWillBeRawPtr<Event> create(const String& eventType) OVERRIDE;
 };
 
 }
 
 #endif