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

third_party/WebKit/Source/core/editing/commands/InsertIntoTextNodeCommand.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 32 matching lines @@
     DCHECK_LE(m_offset, m_node->length());
     DCHECK(!m_text.isEmpty());
 }
 
 void InsertIntoTextNodeCommand::doApply(EditingState*)
 {
     bool passwordEchoEnabled = document().settings() && document().settings()->passwordEchoEnabled();
     if (passwordEchoEnabled)
         document().updateStyleAndLayoutIgnorePendingStylesheets();
 
-    if (!m_node->hasEditableStyle())
+    if (!hasEditableStyle(*m_node))
         return;
 
     if (passwordEchoEnabled) {
         LayoutText* layoutText = m_node->layoutObject();
         if (layoutText && layoutText->isSecure())
             layoutText->momentarilyRevealLastTypedCharacter(m_offset + m_text.length() - 1);
     }
 
     m_node->insertData(m_offset, m_text, IGNORE_EXCEPTION);
     document().updateStyleAndLayout();
 }
 
 void InsertIntoTextNodeCommand::doUnapply()
 {
-    if (!m_node->hasEditableStyle())
+    if (!hasEditableStyle(*m_node))
         return;
 
     m_node->deleteData(m_offset, m_text.length(), IGNORE_EXCEPTION);
     document().updateStyleAndLayout();
 }
 
 DEFINE_TRACE(InsertIntoTextNodeCommand)
 {
     visitor->trace(m_node);
     SimpleEditCommand::trace(visitor);
 }
 
 } // namespace blink