Remove unnecessary includes from collection / nodelist classes

Source/core/dom/LiveNodeListBase.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef LiveNodeListBase_h
 #define LiveNodeListBase_h
 
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
-#include "core/dom/Element.h"
 #include "core/dom/ElementTraversal.h"
-#include "core/dom/NodeTraversal.h"
 #include "core/html/CollectionType.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 enum NodeListRootType {
     NodeListIsRootedAtNode,
     NodeListIsRootedAtDocument
 };
 
@@ skipping 144 matching lines @@
     for (Element* previous = previousMatchingElement(nodeList, currentElement); previous; previous = previousMatchingElement(nodeList, *previous)) {
         if (--currentOffset == offset)
             return previous;
     }
     return 0;
 }
 
 } // namespace blink
 
 #endif // LiveNodeListBase_h