Remove virtual destructors for CustomElementDefinition and CustomElementRegistry

Source/core/dom/custom/CustomElementDefinition.h

 /*
  * Copyright (C) 2012 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 25 matching lines @@
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class CustomElementDefinition : public RefCounted<CustomElementDefinition> {
 public:
     static PassRefPtr<CustomElementDefinition> create(const CustomElementDescriptor&, PassRefPtr<CustomElementLifecycleCallbacks>);
 
-    virtual ~CustomElementDefinition() { }
-
     const CustomElementDescriptor& descriptor() const { return m_descriptor; }
     CustomElementLifecycleCallbacks* callbacks() const { return m_callbacks.get(); }
 
 private:
     CustomElementDefinition(const CustomElementDescriptor&, PassRefPtr<CustomElementLifecycleCallbacks>);
 
     CustomElementDescriptor m_descriptor;
     RefPtr<CustomElementLifecycleCallbacks> m_callbacks;
 };
 
 }
 
 #endif // CustomElementDefinition_h