Split the frame tree logic out of HistoryItem

Source/core/history/HistoryItem.h

 /*
  * Copyright (C) 2006, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. 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
@@ skipping 81 matching lines @@
     long long documentSequenceNumber() const { return m_documentSequenceNumber; }
 
     void setTargetFrameID(int64_t id) { m_targetFrameID = id; }
     int64_t targetFrameID() const { return m_targetFrameID; }
 
     void setFormInfoFromRequest(const ResourceRequest&);
     void setFormData(PassRefPtr<FormData>);
     void setFormContentType(const String&);
 
     void addChildItem(PassRefPtr<HistoryItem>);
-    void setChildItem(PassRefPtr<HistoryItem>);
-    HistoryItem* childItemWithTarget(const String&) const;
-    HistoryItem* childItemWithDocumentSequenceNumber(long long number) const;
     const HistoryItemVector& children() const;
     void clearChildren();
 
-    bool shouldDoSameDocumentNavigationTo(HistoryItem* otherItem) const;
-    bool hasSameFrames(HistoryItem* otherItem) const;
-
     bool isCurrentDocument(Document*) const;
 
-#ifndef NDEBUG
-    int showTree() const;
-    int showTreeWithIndent(unsigned indentLevel) const;
-#endif
-
 private:
     HistoryItem();
     explicit HistoryItem(const HistoryItem&);
 
-    bool hasSameDocumentTree(HistoryItem* otherItem) const;
-
     String m_urlString;
     String m_originalURLString;
     String m_referrer;
     String m_target;
 
     IntPoint m_scrollPoint;
     float m_pageScaleFactor;
     Vector<String> m_documentState;
 
     HistoryItemVector m_children;
@@ skipping 15 matching lines @@
     RefPtr<SerializedScriptValue> m_stateObject;
 
     // info used to repost form data
     RefPtr<FormData> m_formData;
     String m_formContentType;
 
 }; //class HistoryItem
 
 } //namespace WebCore
 
-#ifndef NDEBUG
-// Outside the WebCore namespace for ease of invocation from gdb.
-extern "C" int showTree(const WebCore::HistoryItem*);
-#endif
-
 #endif // HISTORYITEM_H