Remove a lot of dead code from AXNodeObject

Source/core/accessibility/AXObject.h

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * 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.
@@ skipping 400 matching lines @@
     virtual void wordBoundaries(Vector<PlainTextRange>& words) const { }
 
     // Properties of interactive elements.
     virtual String actionVerb() const;
     virtual AccessibilityButtonState checkboxOrRadioValue() const;
     virtual void colorValue(int& r, int& g, int& b) const { r = 0; g = 0; b = 0; }
     virtual String valueDescription() const { return String(); }
     virtual float valueForRange() const { return 0.0f; }
     virtual float maxValueForRange() const { return 0.0f; }
     virtual float minValueForRange() const { return 0.0f; }
-    const AtomicString& placeholderValue() const;
     virtual void selectedChildren(AccessibilityChildrenVector&) { }
     virtual String stringValue() const { return String(); }
 
     // ARIA attributes.
     virtual AXObject* activeDescendant() const { return 0; }
     virtual String ariaDescribedByAttribute() const { return String(); }
     virtual void ariaFlowToElements(AccessibilityChildrenVector&) const { }
     virtual void ariaControlsElements(AccessibilityChildrenVector&) const { }
     virtual void ariaDescribedbyElements(AccessibilityChildrenVector& describedby) const { };
     virtual void ariaLabelledbyElements(AccessibilityChildrenVector& labelledby) const { };
@@ skipping 20 matching lines @@
     void ariaTreeRows(AccessibilityChildrenVector&);
 
     // ARIA live-region features.
     bool supportsARIALiveRegion() const;
     virtual const AtomicString& ariaLiveRegionStatus() const { return nullAtom; }
     virtual const AtomicString& ariaLiveRegionRelevant() const { return nullAtom; }
     virtual bool ariaLiveRegionAtomic() const { return false; }
     virtual bool ariaLiveRegionBusy() const { return false; }
 
     // Accessibility Text.
-    virtual void accessibilityText(Vector<AccessibilityText>&) { };
     virtual String textUnderElement() const { return String(); }
 
     // Accessibility Text - (To be deprecated).
     virtual String accessibilityDescription() const { return String(); }
     virtual String title() const { return String(); }
     virtual String helpText() const { return String(); }
 
     // Location and click point in frame-relative coordinates.
     virtual LayoutRect elementRect() const { return m_explicitElementRect; }
     void setElementRect(LayoutRect r) { m_explicitElementRect = r; }
@@ skipping 105 matching lines @@
 
     bool m_detached;
 };
 
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace WebCore
 
 #endif // AXObject_h