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

third_party/WebKit/Source/core/editing/commands/SplitTextNodeContainingElementCommand.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 29 matching lines @@
 }
 
 void SplitTextNodeContainingElementCommand::doApply(EditingState*)
 {
     DCHECK(m_text);
     DCHECK_GT(m_offset, 0);
 
     splitTextNode(m_text.get(), m_offset);
 
     Element* parent = m_text->parentElement();
-    if (!parent || !parent->parentElement() || !parent->parentElement()->hasEditableStyle())
+    if (!parent || !parent->parentElement() || !hasEditableStyle(*parent->parentElement()))
         return;
 
     LayoutObject* parentLayoutObject = parent->layoutObject();
     if (!parentLayoutObject || !parentLayoutObject->isInline()) {
         wrapContentsInDummySpan(parent);
         Node* firstChild = parent->firstChild();
         if (!firstChild || !firstChild->isElementNode())
             return;
         parent = toElement(firstChild);
     }
 
     splitElement(parent, m_text.get());
 }
 
 DEFINE_TRACE(SplitTextNodeContainingElementCommand)
 {
     visitor->trace(m_text);
     CompositeEditCommand::trace(visitor);
 }
 
 } // namespace blink