Convert raw pointer to PassOwnPtr for EventFactoryBase

Source/core/events/EventFactory.h

 /*
  * Copyright (C) 2011 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 19 matching lines @@
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 class Event;
 
 class EventFactoryBase {
 public:
     virtual PassRefPtrWillBeRawPtr<Event> create(const String& eventType) = 0;
+    virtual ~EventFactoryBase() { }
+
+protected:
+    EventFactoryBase() { }
 };
 
-class EventFactory : public EventFactoryBase {
+class EventFactory FINAL : public EventFactoryBase {
 public:
+    static PassOwnPtr<EventFactory> create()
+    {
+        return adoptPtr(new EventFactory());
+    }
+
     virtual PassRefPtrWillBeRawPtr<Event> create(const String& eventType) OVERRIDE;
 };
 
 }
 
 #endif