Clean up forward declarations in Source/core/editing

Source/core/editing/SpellCheckRequester.h

 /*
  * Copyright (C) 2010 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 21 matching lines @@
 #include "platform/text/TextChecking.h"
 #include "wtf/Deque.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class LocalFrame;
-class Node;
 class SpellCheckRequester;
 class TextCheckerClient;
 
 class SpellCheckRequest FINAL : public TextCheckingRequest {
 public:
     static PassRefPtr<SpellCheckRequest> create(TextCheckingTypeMask, TextCheckingProcessType, PassRefPtrWillBeRawPtr<Range> checkingRange, PassRefPtrWillBeRawPtr<Range> paragraphRange, int requestNumber = 0);
     virtual ~SpellCheckRequest();
 
     PassRefPtrWillBeRawPtr<Range> checkingRange() const { return m_checkingRange; }
     PassRefPtrWillBeRawPtr<Range> paragraphRange() const { return m_paragraphRange; }
@@ skipping 61 matching lines @@
 
     Timer<SpellCheckRequester> m_timerToProcessQueuedRequest;
 
     RefPtr<SpellCheckRequest> m_processingRequest;
     RequestQueue m_requestQueue;
 };
 
 } // namespace blink
 
 #endif // SpellCheckRequester_h