Remove unnecessary includes from collection / nodelist classes

Source/core/html/CollectionIndexCache.h

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. 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.
@@ skipping 14 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * 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.
  */
 
 #ifndef CollectionIndexCache_h
 #define CollectionIndexCache_h
 
-#include "core/dom/Element.h"
-
 namespace blink {
 
 template <typename Collection, typename NodeType>
 class CollectionIndexCache {
     DISALLOW_ALLOCATION();
 public:
     CollectionIndexCache();
 
     bool isEmpty(const Collection& collection)
     {
@@ skipping 152 matching lines @@
         setCachedNodeCount(currentIndex + 1);
         return 0;
     }
     setCachedNode(currentNode, currentIndex);
     return currentNode;
 }
 
 } // namespace blink
 
 #endif // CollectionIndexCache_h