Remove Apple's unused implementation of private browsing from WebCore

Source/WebCore/plugins/PluginViewBase.h

 /*
  * Copyright (C) 2010 Apple Inc. 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
  * notice, this list of conditions and the following disclaimer in the
@@ skipping 26 matching lines @@
 class Scrollbar;
 
 // PluginViewBase is a widget that all plug-in views inherit from, both in Webkit and WebKit2.
 // It's intended as a stopgap measure until we can merge all plug-in views into a single plug-in view.
 class PluginViewBase : public Widget {
 public:
     virtual PlatformLayer* platformLayer() const { return 0; }
 
     virtual NPObject* scriptableObject() { return 0; }
     virtual void storageBlockingStateChanged() { }
-    virtual void privateBrowsingStateChanged(bool) { }
     virtual bool getFormValue(String&) { return false; }
     virtual bool scroll(ScrollDirection, ScrollGranularity) { return false; }
 
     // A plug-in can ask WebKit to handle scrollbars for it.
     virtual Scrollbar* horizontalScrollbar() { return 0; }
     virtual Scrollbar* verticalScrollbar() { return 0; }
 
     // FIXME: This is a hack that works around the fact that the WebKit2 PluginView isn't a ScrollableArea.
     virtual bool wantsWheelEvents() { return false; }
     virtual bool supportsKeyboardFocus() const { return false; }
@@ skipping 20 matching lines @@
     ASSERT(!widget || widget->isPluginViewBase());
     return static_cast<const PluginViewBase*>(widget);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toPluginViewBase(const PluginViewBase*);
 
 } // namespace WebCore
 
 #endif // PluginWidget_h