[Editing][DOM][CodeHealth] Make Node::isContentEditable and Node::isRichEditable global functions.

third_party/WebKit/Source/web/WebElement.cpp

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 43 matching lines @@
 {
     return constUnwrap<Element>()->isTextFormControl();
 }
 
 // TODO(dglazkov): Remove. Consumers of this code should use Node:hasEditableStyle.
 // http://crbug.com/612560
 bool WebElement::isEditable() const
 {
     const Element* element = constUnwrap<Element>();
 
-    if (element->isContentEditable())
+    if (blink::isContentEditable(*element))
         return true;
 
     if (element->isTextFormControl()) {
         const HTMLTextFormControlElement* input = toHTMLTextFormControlElement(element);
         if (!input->isDisabledOrReadOnly())
             return true;
     }
 
     return equalIgnoringCase(element->getAttribute(roleAttr), "textbox");
 }
@@ skipping 88 matching lines @@
     m_private = elem;
     return *this;
 }
 
 WebElement::operator Element*() const
 {
     return toElement(m_private.get());
 }
 
 } // namespace blink