Remove duplicated headers from core/

Source/core/dom/custom/CustomElementRegistry.cpp

 /*
  * 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/dom/custom/CustomElementRegistry.h"
 
 #include "HTMLNames.h"
 #include "SVGNames.h"
 #include "bindings/v8/CustomElementConstructorBuilder.h"
 #include "core/dom/DocumentLifecycleObserver.h"
-#include "core/dom/custom/CustomElement.h"
-#include "core/dom/custom/CustomElementDefinition.h"
 #include "core/dom/custom/CustomElementException.h"
 #include "core/dom/custom/CustomElementRegistrationContext.h"
 
 namespace WebCore {
 
 class RegistrationContextObserver : public DocumentLifecycleObserver {
 public:
     explicit RegistrationContextObserver(Document* document)
         : DocumentLifecycleObserver(document)
         , m_wentAway(!document)
@@ skipping 67 matching lines @@
 
     return definition.get();
 }
 
 CustomElementDefinition* CustomElementRegistry::find(const CustomElementDescriptor& descriptor) const
 {
     return m_definitions.get(descriptor);
 }
 
 } // namespace WebCore