Clean up WebDOMEvent ownership of WebCore::Event.

Source/WebKit/chromium/public/WebDOMEvent.h

Index: Source/WebKit/chromium/public/WebDOMEvent.h
diff --git a/Source/WebKit/chromium/public/WebDOMEvent.h b/Source/WebKit/chromium/public/WebDOMEvent.h
index d85648d8750ae859cb9deba52b659726554f531c..ac7f227f9a3214337546d8190aeecf97b9a0e163 100644
--- a/Source/WebKit/chromium/public/WebDOMEvent.h
+++ b/Source/WebKit/chromium/public/WebDOMEvent.h
@@ -37,6 +37,7 @@
 
 namespace WebCore { class Event; }
 #if WEBKIT_IMPLEMENTATION
+#include "wtf/RefPtr.h"
 namespace WTF { template <typename T> class PassRefPtr; }
 #endif
 
@@ -112,17 +113,17 @@ public:
 
 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());
     }
 };