Reduce forward declarations in core/dom

Source/core/dom/Text.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. 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.
  *
@@ skipping 11 matching lines @@
 
 #ifndef Text_h
 #define Text_h
 
 #include "core/dom/CharacterData.h"
 
 namespace WebCore {
 
 class ExceptionState;
 class RenderText;
-class ExecutionContext;
 
 class Text : public CharacterData {
 public:
     static const unsigned defaultLengthLimit = 1 << 16;
 
     static PassRefPtrWillBeRawPtr<Text> create(Document&, const String&);
     static PassRefPtrWillBeRawPtr<Text> createEditingText(Document&, const String&);
 
     // mergeNextSiblingNodesIfPossible() merges next sibling nodes if possible
     // then returns a node not merged.
@@ skipping 33 matching lines @@
 #ifndef NDEBUG
     virtual void formatForDebugger(char* buffer, unsigned length) const OVERRIDE;
 #endif
 };
 
 DEFINE_NODE_TYPE_CASTS(Text, isTextNode());
 
 } // namespace WebCore
 
 #endif // Text_h