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

third_party/WebKit/Source/core/editing/commands/ApplyStyleCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2008, 2009 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 966 matching lines @@
             if (runEnd == element)
                 runEnd = nextSibling ? nextSibling->previousSibling() : parent->lastChild();
         }
     }
 }
 
 bool ApplyStyleCommand::removeInlineStyleFromElement(EditingStyle* style, HTMLElement* element, EditingState* editingState, InlineStyleRemovalMode mode, EditingStyle* extractedStyle)
 {
     DCHECK(element);
 
-    if (!element->parentNode() || !element->parentNode()->isContentEditable())
+    if (!element->parentNode() || !isContentEditable(*element->parentNode()))
         return false;
 
     if (isStyledInlineElementToRemove(element)) {
         if (mode == RemoveNone)
             return true;
         if (extractedStyle)
             extractedStyle->mergeInlineStyleOfElement(element, EditingStyle::OverrideValues);
         removeNodePreservingChildren(element, editingState);
         if (editingState->isAborted())
             return false;
@@ skipping 471 matching lines @@
     DCHECK(elementToInsert);
     Node* node = passedStartNode;
     Element* element = elementToInsert;
 
     insertNodeBefore(element, node, editingState);
     if (editingState->isAborted())
         return;
 
     while (node) {
         Node* next = node->nextSibling();
-        if (node->isContentEditable()) {
+        if (isContentEditable(*node)) {
             removeNode(node, editingState);
             if (editingState->isAborted())
                 return;
             appendNode(node, element, editingState);
             if (editingState->isAborted())
                 return;
         }
         if (node == endNode)
             break;
         node = next;
@@ skipping 241 matching lines @@
 DEFINE_TRACE(ApplyStyleCommand)
 {
     visitor->trace(m_style);
     visitor->trace(m_start);
     visitor->trace(m_end);
     visitor->trace(m_styledInlineElement);
     CompositeEditCommand::trace(visitor);
 }
 
 } // namespace blink