Remove Apple's unused implementation of private browsing from WebCore

Source/WebCore/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 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
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 969 matching lines @@
 
     // Collect the PluginViews in to a vector to ensure that action the plug-in takes
     // from below storageBlockingStateChanged does not affect their lifetime.
     Vector<RefPtr<PluginViewBase>, 32> pluginViewBases;
     collectPluginViews(pluginViewBases);
 
     for (size_t i = 0; i < pluginViewBases.size(); ++i)
         pluginViewBases[i]->storageBlockingStateChanged();
 }
 
-void Page::privateBrowsingStateChanged()
-{
-    bool privateBrowsingEnabled = m_settings->privateBrowsingEnabled();
-
-    for (Frame* frame = mainFrame(); frame; frame = frame->tree()->traverseNext())
-        frame->document()->privateBrowsingStateDidChange();
-
-    // Collect the PluginViews in to a vector to ensure that action the plug-in takes
-    // from below privateBrowsingStateChanged does not affect their lifetime.
-    Vector<RefPtr<PluginViewBase>, 32> pluginViewBases;
-    collectPluginViews(pluginViewBases);
-
-    for (size_t i = 0; i < pluginViewBases.size(); ++i)
-        pluginViewBases[i]->privateBrowsingStateChanged(privateBrowsingEnabled);
-}
-
 #if !ASSERT_DISABLED
 void Page::checkSubframeCountConsistency() const
 {
     ASSERT(m_subframeCount >= 0);
 
     int subframeCount = 0;
     for (Frame* frame = mainFrame(); frame; frame = frame->tree()->traverseNext())
         ++subframeCount;
 
     ASSERT(m_subframeCount + 1 == subframeCount);
@@ skipping 280 matching lines @@
     , plugInClient(0)
     , validationMessageClient(0)
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 } // namespace WebCore