Clean up forward declarations in Source/core/accessibility

Source/core/accessibility/AXTable.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 17 matching lines @@
 
 #ifndef AXTable_h
 #define AXTable_h
 
 #include "core/accessibility/AXRenderObject.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class AXTableCell;
-class RenderTableSection;
 
 class AXTable : public AXRenderObject {
 
 protected:
     explicit AXTable(RenderObject*);
 public:
     static PassRefPtr<AXTable> create(RenderObject*);
     virtual ~AXTable();
 
     virtual void init() override final;
@@ skipping 37 matching lines @@
     bool hasARIARole() const;
     virtual bool isTableExposableThroughAccessibility() const;
     virtual bool computeAccessibilityIsIgnored() const override final;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXTable, isAXTable());
 
 } // namespace blink
 
 #endif // AXTable_h