Make AttachBehavior a required argument.

Source/core/editing/SplitTextNodeCommand.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 79 matching lines @@
     ContainerNode* parent = m_text2->parentNode();
     if (!parent || !parent->rendererIsEditable())
         return;
 
     insertText1AndTrimText2();
 }
 
 void SplitTextNodeCommand::insertText1AndTrimText2()
 {
     TrackExceptionState es;
-    m_text2->parentNode()->insertBefore(m_text1.get(), m_text2.get(), es);
+    m_text2->parentNode()->insertBefore(m_text1.get(), m_text2.get(), es, DeprecatedAttachNow);
     if (es.hadException())
         return;
     m_text2->deleteData(0, m_offset, es);
 }
 
 #ifndef NDEBUG
 void SplitTextNodeCommand::getNodesInCommand(HashSet<Node*>& nodes)
 {
     addNodeAndDescendants(m_text1.get(), nodes);
     addNodeAndDescendants(m_text2.get(), nodes);
 }
 #endif
 
 } // namespace WebCore