Remove Apple's unused implementation of private browsing from WebCore

Source/WebCore/page/Settings.cpp

Index: Source/WebCore/page/Settings.cpp
diff --git a/Source/WebCore/page/Settings.cpp b/Source/WebCore/page/Settings.cpp
index ad3f3dd7241b49a776637fe1aeda2a1c90d5df75..d2e3b06a0fb6d02dcc64b4298c4068b71af71fcc 100644
--- a/Source/WebCore/page/Settings.cpp
+++ b/Source/WebCore/page/Settings.cpp
@@ -153,7 +153,6 @@ Settings::Settings(Page* page)
     SETTINGS_INITIALIZER_LIST
     , m_isJavaEnabled(false)
     , m_loadsImagesAutomatically(false)
-    , m_privateBrowsingEnabled(false)
     , m_areImagesEnabled(true)
     , m_arePluginsEnabled(false)
     , m_isScriptEnabled(false)
@@ -373,15 +372,6 @@ void Settings::setPluginsEnabled(bool arePluginsEnabled)
     m_arePluginsEnabled = arePluginsEnabled;
 }
 
-void Settings::setPrivateBrowsingEnabled(bool privateBrowsingEnabled)
-{
-    if (m_privateBrowsingEnabled == privateBrowsingEnabled)
-        return;
-
-    m_privateBrowsingEnabled = privateBrowsingEnabled;
-    m_page->privateBrowsingStateChanged();
-}
-
 void Settings::setUserStyleSheetLocation(const KURL& userStyleSheetLocation)
 {
     if (m_userStyleSheetLocation == userStyleSheetLocation)