[Editing][CodeHealth] Make Node::rootEditableElement static

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

 /*
  * Copyright (C) 2014, 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 1057 matching lines @@
 bool AXObjectCacheImpl::inlineTextBoxAccessibilityEnabled()
 {
     Settings* settings = this->settings();
     if (!settings)
         return false;
     return settings->inlineTextBoxAccessibilityEnabled();
 }
 
 const Element* AXObjectCacheImpl::rootAXEditableElement(const Node* node)
 {
-    const Element* result = node->rootEditableElement();
+    const Element* result = rootEditableElement(*node);
     const Element* element = node->isElementNode() ? toElement(node) : node->parentElement();
 
     for (; element; element = element->parentElement()) {
         if (nodeIsTextControl(element))
             result = element;
     }
 
     return result;
 }
 
@@ skipping 189 matching lines @@
     visitor->trace(m_document);
     visitor->trace(m_nodeObjectMapping);
 
     visitor->trace(m_objects);
     visitor->trace(m_notificationsToPost);
 
     AXObjectCache::trace(visitor);
 }
 
 } // namespace blink