Reduce forward declarations in core/rendering

Source/core/rendering/TextAutosizer.h

 /*
  * Copyright (C) 2012 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
@@ skipping 20 matching lines @@
 #include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
 class Document;
 class RenderBlock;
 class RenderObject;
-class RenderText;
 struct TextAutosizingWindowInfo;
 
 // Represents cluster related data. Instances should not persist between calls to processSubtree.
 struct TextAutosizingClusterInfo {
     explicit TextAutosizingClusterInfo(RenderBlock* root)
         : root(root)
         , blockContainingAllText(0)
         , maxAllowedDifferenceFromTextWidth(150)
     {
     }
@@ skipping 87 matching lines @@
 
     // Mapping from a cluster hash to the corresponding cluster infos which have not been autosized yet.
     HashMap<unsigned, OwnPtr<Vector<TextAutosizingClusterInfo> > > m_nonAutosizedClusters;
 
     bool m_previouslyAutosized;
 };
 
 } // namespace WebCore
 
 #endif // TextAutosizer_h