Remove Apple's unused implementation of private browsing from WebCore

Source/WebCore/page/Settings.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.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 116 matching lines @@
 
         void setJavaEnabled(bool);
         bool isJavaEnabled() const { return m_isJavaEnabled; }
 
         void setImagesEnabled(bool);
         bool areImagesEnabled() const { return m_areImagesEnabled; }
 
         void setPluginsEnabled(bool);
         bool arePluginsEnabled() const { return m_arePluginsEnabled; }
 
-        // When this option is set, WebCore will avoid storing any record of browsing activity
-        // that may persist on disk or remain displayed when the option is reset.
-        // This option does not affect the storage of such information in RAM.
-        // The following functions respect this setting:
-        //  - HTML5/DOM Storage
-        //  - Icon Database
-        //  - Console Messages
-        //  - MemoryCache
-        //  - Application Cache
-        //  - Back/Forward Page History
-        //  - Page Search Results
-        //  - HTTP Cookies
-        //  - Plug-ins (that support NPNVprivateModeBool)
-        void setPrivateBrowsingEnabled(bool);
-        bool privateBrowsingEnabled() const { return m_privateBrowsingEnabled; }
-
         void setDNSPrefetchingEnabled(bool);
         bool dnsPrefetchingEnabled() const { return m_dnsPrefetchingEnabled; }
 
         void setUserStyleSheetLocation(const KURL&);
         const KURL& userStyleSheetLocation() const { return m_userStyleSheetLocation; }
 
         static void setDefaultMinDOMTimerInterval(double); // Interval specified in seconds.
         static double defaultMinDOMTimerInterval();
         
         static void setHiddenPageDOMTimerAlignmentInterval(double); // Interval specified in seconds.
@@ skipping 73 matching lines @@
         SecurityOrigin::StorageBlockingPolicy m_storageBlockingPolicy;
         float m_textAutosizingFontScaleFactor;
         IntSize m_textAutosizingWindowSizeOverride;
         bool m_textAutosizingEnabled : 1;
         IntSize m_resolutionDensityPerInchOverride;
 
         SETTINGS_MEMBER_VARIABLES
 
         bool m_isJavaEnabled : 1;
         bool m_loadsImagesAutomatically : 1;
-        bool m_privateBrowsingEnabled : 1;
         bool m_areImagesEnabled : 1;
         bool m_arePluginsEnabled : 1;
         bool m_isScriptEnabled : 1;
         bool m_usesPageCache : 1;
         unsigned m_fontRenderingMode : 1;
         bool m_isCSSCustomFilterEnabled : 1;
         bool m_cssStickyPositionEnabled : 1;
         bool m_cssVariablesEnabled : 1;
         bool m_tiledBackingStoreEnabled : 1;
         bool m_dnsPrefetchingEnabled : 1;
@@ skipping 19 matching lines @@
 #if USE(SAFARI_THEME)
         static bool gShouldPaintNativeControls;
 #endif
 
         static double gHiddenPageDOMTimerAlignmentInterval;
     };
 
 } // namespace WebCore
 
 #endif // Settings_h