Range.deleteContents shouldn't throw HierarchyRequestError on doctype

Source/core/dom/Range.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Gunnstein Lye (gunnstein@netcom.no)
  * (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
  * (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 138 matching lines @@
     void trace(Visitor*);
 
 private:
     explicit Range(Document&);
     Range(Document&, Node* startContainer, int startOffset, Node* endContainer, int endOffset);
 
     void setDocument(Document&);
 
     Node* checkNodeWOffset(Node*, int offset, ExceptionState&) const;
     void checkNodeBA(Node*, ExceptionState&) const;
-    void checkDeleteExtract(ExceptionState&);
+    void checkExtractPrecondition(ExceptionState&);
 
     enum ActionType { DELETE_CONTENTS, EXTRACT_CONTENTS, CLONE_CONTENTS };
     PassRefPtrWillBeRawPtr<DocumentFragment> processContents(ActionType, ExceptionState&);
     static PassRefPtrWillBeRawPtr<Node> processContentsBetweenOffsets(ActionType, PassRefPtrWillBeRawPtr<DocumentFragment>, Node*, unsigned startOffset, unsigned endOffset, ExceptionState&);
     static void processNodes(ActionType, WillBeHeapVector<RefPtrWillBeMember<Node> >&, PassRefPtrWillBeRawPtr<Node> oldContainer, PassRefPtrWillBeRawPtr<Node> newContainer, ExceptionState&);
     enum ContentsProcessDirection { ProcessContentsForward, ProcessContentsBackward };
     static PassRefPtrWillBeRawPtr<Node> processAncestorsAndTheirSiblings(ActionType, Node* container, ContentsProcessDirection, PassRefPtrWillBeRawPtr<Node> clonedContainer, Node* commonRoot, ExceptionState&);
 
     RefPtrWillBeMember<Document> m_ownerDocument; // Cannot be null.
     RangeBoundaryPoint m_start;
     RangeBoundaryPoint m_end;
 };
 
 PassRefPtrWillBeRawPtr<Range> rangeOfContents(Node*);
 
 bool areRangesEqual(const Range*, const Range*);
 
 } // namespace
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::Range*);
 #endif
 
 #endif