Treat inert nodes as aria-hidden instead of aria-disabled.

Source/core/accessibility/AXNodeObject.cpp

 /*
 * 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 651 matching lines @@
 
 bool AXNodeObject::isEnabled() const
 {
     if (equalIgnoringCase(getAttribute(aria_disabledAttr), "true"))
         return false;
 
     Node* node = this->node();
     if (!node || !node->isElementNode())
         return true;
 
-    return !node->isInert() && !toElement(node)->isDisabledFormControl();
+    return !toElement(node)->isDisabledFormControl();
 }
 
 bool AXNodeObject::isIndeterminate() const
 {
     Node* node = this->node();
     if (!node || !node->hasTagName(inputTag))
         return false;
 
     return toHTMLInputElement(node)->shouldAppearIndeterminate();
 }
@@ skipping 400 matching lines @@
     //     <li><a href="#1">Chapter 2</a></li>
     //   </ul>
     // </div>
     //
     // The goal is to return a reasonable title for the outer container div, because
     // it's focusable - but without making its title be the full inner text, which is
     // quite long. As a heuristic, skip links, controls, and elements that are usually
     // containers with lots of children.
 
     // Skip hidden children
-    if (equalIgnoringCase(obj->getAttribute(aria_hiddenAttr), "true"))
+    if (obj->ariaIsHidden())
         return false;
 
     // Skip focusable children, so we don't include the text of links and controls.
     if (obj->canSetFocusAttribute())
         return false;
 
     // Skip big container elements like lists, tables, etc.
     if (obj->isList() || obj->isAXTable() || obj->isTree() || obj->isCanvas())
         return false;
 
@@ skipping 700 matching lines @@
         useTextUnderElement = true;
 
     if (useTextUnderElement) {
         String text = textUnderElement();
         if (!text.isEmpty())
             textOrder.append(AccessibilityText(text, ChildrenText));
     }
 }
 
 } // namespace WebCore