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

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

 /*
  * Copyright (C) 2005, 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 37 matching lines @@
     if (m_atChild->parentNode() != m_element2)
         return;
 
     HeapVector<Member<Node>> children;
     for (Node* node = m_element2->firstChild(); node != m_atChild; node = node->nextSibling())
         children.append(node);
 
     TrackExceptionState exceptionState;
 
     ContainerNode* parent = m_element2->parentNode();
-    if (!parent || !parent->hasEditableStyle())
+    if (!parent || !hasEditableStyle(*parent))
         return;
     parent->insertBefore(m_element1.get(), m_element2.get(), exceptionState);
     if (exceptionState.hadException())
         return;
 
     // Delete id attribute from the second element because the same id cannot be used for more than one element
     m_element2->removeAttribute(HTMLNames::idAttr);
 
     for (const auto& child : children)
         m_element1->appendChild(child, exceptionState);
 }
 
 void SplitElementCommand::doApply(EditingState*)
 {
     m_element1 = m_element2->cloneElementWithoutChildren();
 
     executeApply();
 }
 
 void SplitElementCommand::doUnapply()
 {
-    if (!m_element1 || !m_element1->hasEditableStyle() || !m_element2->hasEditableStyle())
+    if (!m_element1 || !hasEditableStyle(*m_element1) || !hasEditableStyle(*m_element2))
         return;
 
     NodeVector children;
     getChildNodes(*m_element1, children);
 
     Node* refChild = m_element2->firstChild();
 
     for (const auto& child : children)
         m_element2->insertBefore(child, refChild, IGNORE_EXCEPTION);
 
@@ skipping 15 matching lines @@
 
 DEFINE_TRACE(SplitElementCommand)
 {
     visitor->trace(m_element1);
     visitor->trace(m_element2);
     visitor->trace(m_atChild);
     SimpleEditCommand::trace(visitor);
 }
 
 } // namespace blink