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

third_party/WebKit/Source/core/editing/commands/RemoveNodeCommand.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 27 matching lines @@
     , m_shouldAssumeContentIsAlwaysEditable(shouldAssumeContentIsAlwaysEditable)
 {
     DCHECK(m_node);
     DCHECK(m_node->parentNode());
 }
 
 void RemoveNodeCommand::doApply(EditingState* editingState)
 {
     ContainerNode* parent = m_node->parentNode();
     if (!parent || (m_shouldAssumeContentIsAlwaysEditable == DoNotAssumeContentIsAlwaysEditable
-        && !parent->isContentEditable() && parent->inActiveDocument()))
+        && !isContentEditable(*parent) && parent->inActiveDocument()))
         return;
-    DCHECK(parent->isContentEditable() || !parent->inActiveDocument()) << parent;
+    DCHECK(isContentEditable(*parent) || !parent->inActiveDocument()) << parent;
 
     m_parent = parent;
     m_refChild = m_node->nextSibling();
 
     m_node->remove(IGNORE_EXCEPTION);
     // Node::remove dispatch synchronous events such as IFRAME unload events,
     // and event handlers may break the document. We check the document state
     // here in order to prevent further processing in bad situation.
     ABORT_EDITING_COMMAND_IF(!m_node->document().frame());
     ABORT_EDITING_COMMAND_IF(!m_node->document().documentElement());
@@ skipping 11 matching lines @@
 
 DEFINE_TRACE(RemoveNodeCommand)
 {
     visitor->trace(m_node);
     visitor->trace(m_parent);
     visitor->trace(m_refChild);
     SimpleEditCommand::trace(visitor);
 }
 
 } // namespace blink