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

Source/modules/InitModules.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 InitModules_h
 #define InitModules_h
 
 #include "core/Init.h"
 #include "platform/heap/Handle.h"
 
 namespace WebCore {
 
 class Event;
 class ExceptionState;
 
 class ModulesInitializer : public CoreInitializer {
 public:
+    virtual void registerEventFactory() OVERRIDE;
     virtual void initEventNames() OVERRIDE;
     virtual void initEventTargetNames() OVERRIDE;
 };
 
 PassRefPtrWillBeRawPtr<Event> createEventModules(const String& eventType, ExceptionState&);
 
 } // namespace WebCore
 
 #endif // InitModules_h