Have getChildNodes() take a ContainerNode in argument

Source/core/editing/SplitElementCommand.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 64 matching lines @@
     m_element1 = m_element2->cloneElementWithoutChildren();
 
     executeApply();
 }
 
 void SplitElementCommand::doUnapply()
 {
     if (!m_element1 || !m_element1->hasEditableStyle() || !m_element2->hasEditableStyle())
         return;
 
-    WillBeHeapVector<RefPtrWillBeMember<Node> > children;
-    for (Node* node = m_element1->firstChild(); node; node = node->nextSibling())
-        children.append(node);
+    NodeVector children;
+    getChildNodes(*m_element1, children);
 
     RefPtrWillBeRawPtr<Node> refChild = m_element2->firstChild();
 
     size_t size = children.size();
     for (size_t i = 0; i < size; ++i)
         m_element2->insertBefore(children[i].get(), refChild.get(), IGNORE_EXCEPTION);
 
     // Recover the id attribute of the original element.
     const AtomicString& id = m_element1->getAttribute(HTMLNames::idAttr);
     if (!id.isNull())
@@ skipping 12 matching lines @@
 
 void SplitElementCommand::trace(Visitor* visitor)
 {
     visitor->trace(m_element1);
     visitor->trace(m_element2);
     visitor->trace(m_atChild);
     SimpleEditCommand::trace(visitor);
 }
 
 } // namespace blink