Remove duplicated headers from core/

Source/core/dom/custom/CustomElementCallbackScheduler.cpp

 /*
  * Copyright (C) 2013 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 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/dom/custom/CustomElementCallbackScheduler.h"
 
 #include "core/dom/Element.h"
 #include "core/dom/custom/CustomElementCallbackDispatcher.h"
-#include "core/dom/custom/CustomElementCallbackQueue.h"
 #include "core/dom/custom/CustomElementLifecycleCallbacks.h"
 
 namespace WebCore {
 
 void CustomElementCallbackScheduler::scheduleAttributeChangedCallback(PassRefPtr<CustomElementLifecycleCallbacks> callbacks, PassRefPtr<Element> element, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue)
 {
     if (!callbacks->hasAttributeChangedCallback())
         return;
 
     CustomElementCallbackQueue* queue = instance().schedule(element);
@@ skipping 66 matching lines @@
 // stack. Because callback queues are processed exhaustively, this
 // effectively moves the callback queue to the top of the stack.
 CustomElementCallbackQueue* CustomElementCallbackScheduler::scheduleInCurrentElementQueue(PassRefPtr<Element> element)
 {
     CustomElementCallbackQueue* callbackQueue = ensureCallbackQueue(element);
     CustomElementCallbackDispatcher::instance().enqueue(callbackQueue);
     return callbackQueue;
 }
 
 } // namespace WebCore