Clean up forward declarations in WebKit/Source

Source/core/dom/AXObjectCache.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010, 2011 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #ifndef AXObjectCache_h
 #define AXObjectCache_h
 
 #include "core/dom/Document.h"
 
 typedef unsigned AXID;
 
 namespace blink {
 class AXObject;
-class AbstractInlineTextBox;
 class FrameView;
 class Page;
 class RenderMenuList;
 class Widget;
 
 class AXObjectCache {
     WTF_MAKE_NONCOPYABLE(AXObjectCache); WTF_MAKE_FAST_ALLOCATED;
 public:
     static AXObjectCache* create(Document&);
 
@@ skipping 74 matching lines @@
     virtual void handleLayoutComplete(RenderObject*) = 0;
     virtual void handleScrolledToAnchor(const Node* anchorNode) = 0;
 
 protected:
     AXObjectCache();
 };
 
 }
 
 #endif