Remove more dead code from accessibility/ folder

Source/core/accessibility/AXObject.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 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 386 matching lines @@
 bool AXObject::ariaIsMultiline() const
 {
     return equalIgnoringCase(getAttribute(aria_multilineAttr), "true");
 }
 
 bool AXObject::ariaPressedIsPresent() const
 {
     return !getAttribute(aria_pressedAttr).isEmpty();
 }
 
-const AtomicString& AXObject::invalidStatus() const
-{
-    DEFINE_STATIC_LOCAL(const AtomicString, invalidStatusFalse, ("false", AtomicString::ConstructFromLiteral));
-
-    // aria-invalid can return false (default), grammer, spelling, or true.
-    const AtomicString& ariaInvalid = getAttribute(aria_invalidAttr);
-
-    // If empty or not present, it should return false.
-    if (ariaInvalid.isEmpty())
-        return invalidStatusFalse;
-
-    return ariaInvalid;
-}
-
 bool AXObject::supportsARIAAttributes() const
 {
     return supportsARIALiveRegion()
         || supportsARIADragging()
         || supportsARIADropping()
         || supportsARIAFlowTo()
         || supportsARIAOwns()
         || hasAttribute(aria_labelAttr);
 }
 
@@ skipping 476 matching lines @@
         return ToggleButtonRole;
     if (ariaHasPopup())
         return PopUpButtonRole;
     // We don't contemplate RadioButtonRole, as it depends on the input
     // type.
 
     return ButtonRole;
 }
 
 } // namespace WebCore