Clean up unused AX APIs.

Source/modules/accessibility/AXNodeObject.h

Index: Source/modules/accessibility/AXNodeObject.h
diff --git a/Source/modules/accessibility/AXNodeObject.h b/Source/modules/accessibility/AXNodeObject.h
index 1b2f7818a46e43dbd1097f1b4019e801b3928f3a..91b2d55f02d34768dbf00084cd97674409151e6e 100644
--- a/Source/modules/accessibility/AXNodeObject.h
+++ b/Source/modules/accessibility/AXNodeObject.h
@@ -153,14 +153,11 @@ protected:
     virtual float maxValueForRange() const override;
     virtual float minValueForRange() const override;
     virtual String stringValue() const override;
-    virtual const AtomicString& textInputType() const override;
 
     // ARIA attributes.
     virtual String ariaDescribedByAttribute() const override final;
-    virtual const AtomicString& ariaDropEffect() const override final;
     virtual String ariaLabeledByAttribute() const override final;
     virtual AccessibilityRole ariaRoleAttribute() const override final;
-    virtual AccessibilityOptionalBool isAriaGrabbed() const override final;
 
     // Accessibility Text.
     virtual String deprecatedTextUnderElement(TextUnderElementMode) const override;