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

third_party/WebKit/Source/core/editing/commands/MergeIdenticalElementsCommand.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 25 matching lines @@
     , m_element1(first)
     , m_element2(second)
 {
     DCHECK(m_element1);
     DCHECK(m_element2);
     DCHECK_EQ(m_element1->nextSibling(), m_element2);
 }
 
 void MergeIdenticalElementsCommand::doApply(EditingState*)
 {
-    if (m_element1->nextSibling() != m_element2 || !m_element1->hasEditableStyle() || !m_element2->hasEditableStyle())
+    if (m_element1->nextSibling() != m_element2 || !hasEditableStyle(*m_element1) || !hasEditableStyle(*m_element2))
         return;
 
     m_atChild = m_element2->firstChild();
 
     NodeVector children;
     getChildNodes(*m_element1, children);
 
     for (auto& child : children)
         m_element2->insertBefore(child.release(), m_atChild.get(), IGNORE_EXCEPTION);
 
     m_element1->remove(IGNORE_EXCEPTION);
 }
 
 void MergeIdenticalElementsCommand::doUnapply()
 {
     DCHECK(m_element1);
     DCHECK(m_element2);
 
     Node* atChild = m_atChild.release();
 
     ContainerNode* parent = m_element2->parentNode();
-    if (!parent || !parent->hasEditableStyle())
+    if (!parent || !hasEditableStyle(*parent))
         return;
 
     TrackExceptionState exceptionState;
 
     parent->insertBefore(m_element1.get(), m_element2.get(), exceptionState);
     if (exceptionState.hadException())
         return;
 
     HeapVector<Member<Node>> children;
     for (Node* child = m_element2->firstChild(); child && child != atChild; child = child->nextSibling())
         children.append(child);
 
     for (auto& child : children)
         m_element1->appendChild(child.release(), exceptionState);
 }
 
 DEFINE_TRACE(MergeIdenticalElementsCommand)
 {
     visitor->trace(m_element1);
     visitor->trace(m_element2);
     visitor->trace(m_atChild);
     SimpleEditCommand::trace(visitor);
 }
 
 } // namespace blink