Clean up forward declarations in Source/core/accessibility

Source/core/accessibility/AXNodeObject.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 12 matching lines @@
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AXNodeObject_h
 #define AXNodeObject_h
 
 #include "core/accessibility/AXObject.h"
-#include "platform/geometry/LayoutRect.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
-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 LayoutRect;
 class Node;
-class RenderListBox;
-class RenderTextControl;
-class RenderView;
-class VisibleSelection;
-class Widget;
 
 class AXNodeObject : public AXObject {
 protected:
     explicit AXNodeObject(Node*);
 
 public:
     static PassRefPtr<AXNodeObject> create(Node*);
     virtual ~AXNodeObject();
 
 protected:
@@ skipping 142 matching lines @@
     void ariaLabeledByText(Vector<AccessibilityText>&) const;
     void changeValueByPercent(float percentChange);
     float stepValueForRange() const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXNodeObject, isAXNodeObject());
 
 } // namespace blink
 
 #endif // AXNodeObject_h