Clean up htmlediting

Source/core/editing/BreakBlockquoteCommand.cpp

 /*
  * Copyright (C) 2005 Apple Computer, 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 134 matching lines @@
     RefPtrWillBeRawPtr<Element> clonedAncestor = clonedBlockquote;
     for (size_t i = ancestors.size(); i != 0; --i) {
         RefPtrWillBeRawPtr<Element> clonedChild = ancestors[i - 1]->cloneElementWithoutChildren();
         // Preserve list item numbering in cloned lists.
         if (isHTMLOListElement(*clonedChild)) {
             Node* listChildNode = i > 1 ? ancestors[i - 2].get() : startNode;
             // The first child of the cloned list might not be a list item element,
             // find the first one so that we know where to start numbering.
             while (listChildNode && !isHTMLLIElement(*listChildNode))
                 listChildNode = listChildNode->nextSibling();
-            if (listChildNode && listChildNode->renderer() && listChildNode->renderer()->isListItem())
+            if (isListItem(listChildNode))
                 setNodeAttribute(clonedChild, startAttr, AtomicString::number(toRenderListItem(listChildNode->renderer())->value()));
         }
 
         appendNode(clonedChild.get(), clonedAncestor.get());
         clonedAncestor = clonedChild;
     }
 
     moveRemainingSiblingsToNewParent(startNode, 0, clonedAncestor);
 
     if (!ancestors.isEmpty()) {
@@ skipping 16 matching lines @@
 
     // Make sure the cloned block quote renders.
     addBlockPlaceholderIfNeeded(clonedBlockquote.get());
 
     // Put the selection right before the break.
     setEndingSelection(VisibleSelection(positionBeforeNode(breakElement.get()), DOWNSTREAM, endingSelection().isDirectional()));
     rebalanceWhitespace();
 }
 
 } // namespace blink