Remove duplicated headers from core/

Source/core/dom/shadow/ElementShadow.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 13 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/dom/shadow/ElementShadow.h"
 
 #include "core/dom/ContainerNodeAlgorithms.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/shadow/ContentDistribution.h"
-#include "core/dom/shadow/InsertionPoint.h"
-#include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/shadow/HTMLContentElement.h"
 #include "core/html/shadow/HTMLShadowElement.h"
 
 namespace WebCore {
 
 class DistributionPool {
 public:
     explicit DistributionPool(const ContainerNode&);
     void clear();
     ~DistributionPool();
@@ skipping 321 matching lines @@
 
 void ElementShadow::clearDistribution()
 {
     m_nodeToInsertionPoints.clear();
 
     for (ShadowRoot* root = youngestShadowRoot(); root; root = root->olderShadowRoot())
         root->setShadowInsertionPointOfYoungerShadowRoot(0);
 }
 
 } // namespace