Remove Apple's unused implementation of private browsing from WebCore

Source/WebCore/loader/icon/IconDatabase.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
  *
  * 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 87 matching lines @@
 
     virtual Image* synchronousIconForPageURL(const String&, const IntSize&);
     virtual PassNativeImagePtr synchronousNativeIconForPageURL(const String& pageURLOriginal, const IntSize&);
     virtual String synchronousIconURLForPageURL(const String&);
     virtual bool synchronousIconDataKnownForIconURL(const String&);
     virtual IconLoadDecision synchronousLoadDecisionForIconURL(const String&, DocumentLoader*);    
     
     virtual void setEnabled(bool);
     virtual bool isEnabled() const;
     
-    virtual void setPrivateBrowsingEnabled(bool flag);
-    bool isPrivateBrowsingEnabled() const;
-    
     static void delayDatabaseCleanup();
     static void allowDatabaseCleanup();
     static void checkIntegrityBeforeOpening();
         
     // Support for WebCoreStatistics in WebKit
     virtual size_t pageURLMappingCount();
     virtual size_t retainedPageURLCount();
     virtual size_t iconRecordCount();
     virtual size_t iconRecordCountWithData();
 
@@ skipping 25 matching lines @@
 public:
     virtual bool isOpen() const;
     virtual String databasePath() const;
     static String defaultDatabaseFilename();
 
 private:
     PassRefPtr<IconRecord> getOrCreateIconRecord(const String& iconURL);
     PageURLRecord* getOrCreatePageURLRecord(const String& pageURL);
     
     bool m_isEnabled;
-    bool m_privateBrowsingEnabled;
 
     mutable Mutex m_syncLock;
     ThreadCondition m_syncCondition;
     String m_databaseDirectory;
     // Holding m_syncLock is required when accessing m_completeDatabasePath
     String m_completeDatabasePath;
 
     bool m_threadTerminationRequested;
     bool m_removeIconsRequested;
     bool m_iconURLImportComplete;
@@ skipping 88 matching lines @@
     OwnPtr<SQLiteStatement> m_updateIconDataStatement;
     OwnPtr<SQLiteStatement> m_setIconInfoStatement;
     OwnPtr<SQLiteStatement> m_setIconDataStatement;
 };
 
 #endif // !ENABLE(ICONDATABASE)
 
 } // namespace WebCore
 
 #endif // IconDatabase_h