Clean up WebDOMEvent ownership of WebCore::Event.

public/platform/WebPrivatePtr.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 33 matching lines @@
 // wrap a reference counted WebCore class.
 template <typename T>
 class WebPrivatePtr {
 public:
     WebPrivatePtr() : m_ptr(0) { }
     ~WebPrivatePtr() { WEBKIT_ASSERT(!m_ptr); }
 
     bool isNull() const { return !m_ptr; }
 
 #if WEBKIT_IMPLEMENTATION
+    WebPrivatePtr(const WebPrivatePtr& other)
+        : m_ptr(other.m_ptr)
+    {
+        if (m_ptr)
+            m_ptr->ref();
+    }
+

[abarth-chromium, 2013/05/22 16:21:49]

We shouldn't need to modify WebPrivatePtr

     WebPrivatePtr(const PassRefPtr<T>& prp)
         : m_ptr(prp.leakRef())
     {
     }
 
     void reset()
     {
         assign(0);
     }
 
@@ skipping 26 matching lines @@
 
 private:
 #if WEBKIT_IMPLEMENTATION
     void assign(T* p)
     {
         // p is already ref'd for us by the caller
         if (m_ptr)
             m_ptr->deref();
         m_ptr = p;
     }
+#else
+    // Disable copy and assign; we define them above for the implementation, but
+    // we need to make sure that they aren't used outside there; the compiler-
+    // provided versions won't handle reference counting properly.
+    WebPrivatePtr(const WebPrivatePtr<T>&);
+    WebPrivatePtr<T>& operator=(const WebPrivatePtr<T>& other);
 #endif
 
     T* m_ptr;
 };
 
 } // namespace WebKit
 
 #endif