Remove virtual destructors for CustomElementDefinition and CustomElementRegistry

Source/core/dom/custom/CustomElementRegistry.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:
  *
  * 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
@@ skipping 35 matching lines @@
 class CustomElementConstructorBuilder;
 class Document;
 class ExceptionState;
 
 class CustomElementRegistry {
     WTF_MAKE_NONCOPYABLE(CustomElementRegistry);
 protected:
     friend class CustomElementRegistrationContext;
 
     CustomElementRegistry() { }
-    virtual ~CustomElementRegistry() { }
 
     CustomElementDefinition* registerElement(Document*, CustomElementConstructorBuilder*, const AtomicString& name, CustomElement::NameSet validNames, ExceptionState&);
     CustomElementDefinition* find(const CustomElementDescriptor&) const;
 
 private:
     typedef HashMap<CustomElementDescriptor, RefPtr<CustomElementDefinition> > DefinitionMap;
     DefinitionMap m_definitions;
     HashSet<AtomicString> m_registeredTypeNames;
 };
 
 } // namespace WebCore
 
 #endif