blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/dom/StaticNodeList.h

 /*
  * Copyright (C) 2007, 2008 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 16 matching lines @@
  */
 
 #ifndef StaticNodeList_h
 #define StaticNodeList_h
 
 #include "core/dom/NodeList.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-class Element;
 class Node;
 
 template <typename NodeType>
 class StaticNodeTypeList final : public NodeList {
  public:
   static StaticNodeTypeList* adopt(HeapVector<Member<NodeType>>& nodes);
 
   static StaticNodeTypeList* createEmpty() { return new StaticNodeTypeList; }
 
   ~StaticNodeTypeList() override;
@@ skipping 45 matching lines @@
 template <typename VisitorDispatcher>
 ALWAYS_INLINE void StaticNodeTypeList<NodeType>::traceImpl(
     VisitorDispatcher visitor) {
   visitor->trace(m_nodes);
   NodeList::trace(visitor);
 }
 
 }  // namespace blink
 
 #endif  // StaticNodeList_h