Move Node::lengthOfContents into Range, its only user.

third_party/WebKit/Source/core/dom/Node.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004-2011, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 754 matching lines @@
     checkSlotChange(SlotChangeType::Initial);
   }
   void checkSlotChangeBeforeRemoved() {
     checkSlotChange(SlotChangeType::Initial);
   }
 
   DECLARE_VIRTUAL_TRACE();
 
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
-  unsigned lengthOfContents() const;
-
  private:
   enum NodeFlags {
     HasRareDataFlag = 1,
 
     // Node type flags. These never change once created.
     IsTextFlag = 1 << 1,
     IsContainerFlag = 1 << 2,
     IsElementFlag = 1 << 3,
     IsHTMLFlag = 1 << 4,
     IsSVGFlag = 1 << 5,
@@ skipping 222 matching lines @@
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showNode(const blink::Node*);
 void showTree(const blink::Node*);
 void showNodePath(const blink::Node*);
 #endif
 
 #endif  // Node_h