Remove a lot of dead code from AXNodeObject

Source/core/accessibility/AXMediaControls.h

 /*
  * Copyright (C) 2009 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 32 matching lines @@
 
     virtual AccessibilityRole roleValue() const OVERRIDE;
 
     virtual String title() const OVERRIDE FINAL;
     virtual String accessibilityDescription() const OVERRIDE;
     virtual String helpText() const OVERRIDE;
 
 protected:
     explicit AccessibilityMediaControl(RenderObject*);
     MediaControlElementType controlType() const;
-    virtual void accessibilityText(Vector<AccessibilityText>&) OVERRIDE FINAL;
     virtual bool computeAccessibilityIsIgnored() const OVERRIDE;
 };
 
 
 class AccessibilityMediaTimeline FINAL : public AXSlider {
 
 public:
     static PassRefPtr<AXObject> create(RenderObject*);
     virtual ~AccessibilityMediaTimeline() { }
 
@@ skipping 37 matching lines @@
 
 private:
     explicit AccessibilityMediaTimeDisplay(RenderObject*);
     virtual bool computeAccessibilityIsIgnored() const OVERRIDE;
 };
 
 
 } // namespace WebCore
 
 #endif // AXMediaControls_h