Remove virtual from functions that are never overridden.

Source/core/accessibility/AccessibilityNodeObject.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 101 matching lines @@
     virtual bool isImage() const;
     virtual bool isImageButton() const;
     virtual bool isInputImage() const;
     virtual bool isLink() const;
     virtual bool isMenu() const;
     virtual bool isMenuBar() const;
     virtual bool isMenuButton() const;
     virtual bool isMenuItem() const;
     virtual bool isMenuRelated() const;
     virtual bool isMultiSelectable() const;
-    virtual bool isNativeCheckboxOrRadio() const;
+    bool isNativeCheckboxOrRadio() const;
     virtual bool isNativeImage() const;
     virtual bool isNativeTextControl() const;
     virtual bool isPasswordField() const;
     virtual bool isProgressIndicator() const;
     virtual bool isSearchField() const;
     virtual bool isSlider() const;
 
     // Check object state.
     virtual bool isChecked() const;
     virtual bool isEnabled() const;
@@ skipping 92 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isAccessibilityNodeObject());
     return static_cast<const AccessibilityNodeObject*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toAccessibilityNodeObject(const AccessibilityNodeObject*);
 
 } // namespace WebCore
 
 #endif // AccessibilityNodeObject_h