AX nodes that aren't contenteditable should be readonly.

Source/modules/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 779 matching lines @@
 
     if (isHTMLTextAreaElement(*node))
         return toHTMLTextAreaElement(*node).isReadOnly();
 
     if (isHTMLInputElement(*node)) {
         HTMLInputElement& input = toHTMLInputElement(*node);
         if (input.isTextField())
             return input.isReadOnly();
     }
 
-    return !node->hasEditableStyle();
+    return AXObject::isReadOnly();
 }
 
 bool AXNodeObject::isRequired() const
 {
     Node* n = this->node();
     if (n && (n->isElementNode() && toElement(n)->isFormControlElement()))
         return toHTMLFormControlElement(n)->isRequired();
 
     if (equalIgnoringCase(getAttribute(aria_requiredAttr), "true"))
         return true;
@@ skipping 1181 matching lines @@
     float range = maxValueForRange() - minValueForRange();
     float value = valueForRange();
 
     value += range * (percentChange / 100);
     setValue(String::number(value));
 
     axObjectCache()->postNotification(node(), AXObjectCacheImpl::AXValueChanged, true);
 }
 
 } // namespace blink