Remove Node Document friend relationship

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
  * License as published by the Free Software Foundation; either
@@ skipping 111 matching lines @@
 #else
 // TreeShared should be the last to pack TreeShared::m_refCount and
 // Node::m_nodeFlags on 64bit platforms.
 #define NODE_BASE_CLASSES public EventTarget, public TreeShared<Node>
 #endif
 
 class Node : NODE_BASE_CLASSES {
     DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(TreeShared<Node>);
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Node);
-    friend class Document;
     friend class TreeScope;
     friend class TreeScopeAdopter;
 public:
     enum NodeType {
         ELEMENT_NODE = 1,
         ATTRIBUTE_NODE = 2,
         TEXT_NODE = 3,
         CDATA_SECTION_NODE = 4,
         PROCESSING_INSTRUCTION_NODE = 7,
         COMMENT_NODE = 8,
@@ skipping 632 matching lines @@
     bool isTreeScopeInitialized() const { return m_treeScope; }
 
     void markAncestorsWithChildNeedsStyleRecalc();
 
     void setIsFinishedParsingChildren(bool value) { setFlag(value, IsFinishedParsingChildrenFlag); }
 
 private:
     friend class TreeShared<Node>;
     friend class WeakNodeMap;
 
-    unsigned styledSubtreeSize() const;
-
 #if !ENABLE(OILPAN)
     void removedLastRef();
 #endif
     bool hasTreeSharedParent() const { return !!parentOrShadowHostNode(); }
 
     enum EditableLevel { Editable, RichlyEditable };
     bool hasEditableStyle(EditableLevel, UserSelectAllTreatment = UserSelectAllIsAlwaysNonEditable) const;
     bool isEditableToAccessibility(EditableLevel) const;
 
     bool isUserActionElementActive() const;
@@ skipping 102 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