Remove duplicated headers from core/

Source/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple 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 31 matching lines @@
 #include "core/html/HTMLLabelElement.h"
 #include "core/html/HTMLMapElement.h"
 #include "core/page/DOMSelection.h"
 #include "core/page/FocusController.h"
 #include "core/frame/Frame.h"
 #include "core/frame/FrameView.h"
 #include "core/page/Page.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderView.h"
 #include "wtf/Vector.h"
-#include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 struct SameSizeAsTreeScope {
     virtual ~SameSizeAsTreeScope();
     void* pointers[8];
     int ints[1];
 };
 
 COMPILE_ASSERT(sizeof(TreeScope) == sizeof(SameSizeAsTreeScope), treescope_should_stay_small);
@@ skipping 430 matching lines @@
             result = element;
         for (ShadowRoot* shadowRoot = element->youngestShadowRoot(); shadowRoot; shadowRoot = shadowRoot->olderShadowRoot()) {
             if (Element* shadowResult = shadowRoot->getElementByAccessKey(key))
                 result = shadowResult;
         }
     }
     return result;
 }
 
 } // namespace WebCore