[Editing][DOM][CodeHealth] Make Node::hasEditableStyle global functions.

third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp

 /*
 * Copyright (C) 2008 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 476 matching lines @@
     return viewRect.isEmpty();
 }
 
 bool AXLayoutObject::isReadOnly() const
 {
     ASSERT(m_layoutObject);
 
     if (isWebArea()) {
         Document& document = m_layoutObject->document();
         HTMLElement* body = document.body();
-        if (body && body->hasEditableStyle())
+        if (body && hasEditableStyle(*body))
             return false;
 
-        return !document.hasEditableStyle();
+        return !hasEditableStyle(document);
     }
 
     return AXNodeObject::isReadOnly();
 }
 
 bool AXLayoutObject::isVisited() const
 {
     // FIXME: Is it a privacy violation to expose visited information to accessibility APIs?
     return m_layoutObject->style()->isLink() && m_layoutObject->style()->insideLink() == InsideVisitedLink;
 }
@@ skipping 2059 matching lines @@
                     result.unite(labelRect);
                 }
             }
         }
     }
 
     return result;
 }
 
 } // namespace blink