Clean up forward declarations in Source/core/accessibility

Source/core/accessibility/AXRenderObject.h

 /*
  * Copyright (C) 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 18 matching lines @@
 #ifndef AXRenderObject_h
 #define AXRenderObject_h
 
 #include "core/accessibility/AXNodeObject.h"
 #include "platform/geometry/LayoutRect.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class AXSVGRoot;
-class AXObjectCache;
 class Element;
-class LocalFrame;
 class FrameView;
-class HitTestResult;
-class HTMLAnchorElement;
 class HTMLAreaElement;
-class HTMLElement;
-class HTMLLabelElement;
-class HTMLMapElement;
-class HTMLSelectElement;
 class IntPoint;
-class IntSize;
 class Node;
-class RenderListBox;
-class RenderTextControl;
-class RenderView;
 class VisibleSelection;
 class Widget;
 
 class AXRenderObject : public AXNodeObject {
 protected:
     explicit AXRenderObject(RenderObject*);
 public:
     static PassRefPtr<AXRenderObject> create(RenderObject*);
     virtual ~AXRenderObject();
 
@@ skipping 165 matching lines @@
     VisibleSelection selection() const;
     int indexForVisiblePosition(const VisiblePosition&) const;
     void accessibilityChildrenFromAttribute(QualifiedName attr, AccessibilityChildrenVector&) const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXRenderObject, isAXRenderObject());
 
 } // namespace blink
 
 #endif // AXRenderObject_h