Clean up WebDOMEvent ownership of WebCore::Event.

Source/WebKit/chromium/public/WebDOMEvent.h

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 
 #ifndef WebDOMEvent_h
 #define WebDOMEvent_h
 
 #include "../../../../public/platform/WebCommon.h"
 #include "../../../../public/platform/WebString.h"
 #include "WebNode.h"
 
 namespace WebCore { class Event; }
 #if WEBKIT_IMPLEMENTATION
+#include "wtf/RefPtr.h"
 namespace WTF { template <typename T> class PassRefPtr; }
 #endif
 
 namespace WebKit {
 
 class WebDOMEvent {
 public:
     enum PhaseType {
         CapturingPhase     = 1,
         AtTarget           = 2,
@@ skipping 55 matching lines @@
 
     template<typename T> const T toConst() const
     {
         T res;
         res.WebDOMEvent::assign(*this);
         return res;
     }
 
 protected:
     typedef WebCore::Event WebDOMEventPrivate;
-    void assign(WebDOMEventPrivate*);
-    WebDOMEventPrivate* m_private;
+    void assign(const WTF::PassRefPtr<WebDOMEventPrivate>&);
+    WTF::RefPtr<WebDOMEventPrivate> m_private;

[abarth-chromium, 2013/05/20 22:04:45]

We can't use WTF::RefPtr directly because the consumer of the API can't see it. 
We should be able to use WebPrivatePtr though.

 
     template<typename T> T* unwrap()
     {
-        return static_cast<T*>(m_private);
+        return static_cast<T*>(m_private.get());
     }
 
     template<typename T> const T* constUnwrap() const
     {
-        return static_cast<const T*>(m_private);
+        return static_cast<const T*>(m_private.get());
     }
 };
 
 } // namespace WebKit
 
 #endif