Range object should check root node identify instead of inActiveDocument().

third_party/WebKit/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
@@ skipping 164 matching lines @@
   Range(Document&,
         Node* startContainer,
         int startOffset,
         Node* endContainer,
         int endOffset);
 
   void setDocument(Document&);
 
   void checkNodeBA(Node*, ExceptionState&) const;
   void checkExtractPrecondition(ExceptionState&);
+  bool hasSameRoot(const Node&) const;
 
   enum ActionType { DELETE_CONTENTS, EXTRACT_CONTENTS, CLONE_CONTENTS };
   DocumentFragment* processContents(ActionType, ExceptionState&);
   static Node* processContentsBetweenOffsets(ActionType,
                                              DocumentFragment*,
                                              Node*,
                                              unsigned startOffset,
                                              unsigned endOffset,
                                              ExceptionState&);
   static void processNodes(ActionType,
@@ skipping 22 matching lines @@
 using RangeVector = HeapVector<Member<Range>>;
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::Range*);
 #endif
 
 #endif  // Range_h