Remove Apple's unused implementation of private browsing from WebCore

Source/WebCore/platform/SchemeRegistry.h

Index: Source/WebCore/platform/SchemeRegistry.h
diff --git a/Source/WebCore/platform/SchemeRegistry.h b/Source/WebCore/platform/SchemeRegistry.h
index f3bd0718e3f1fdc16e268e7600ba764ec9e32f43..6e7b6608baea7d62389a16f469e10a795efa2ad0 100644
--- a/Source/WebCore/platform/SchemeRegistry.h
+++ b/Source/WebCore/platform/SchemeRegistry.h
@@ -72,13 +72,6 @@ public:
     static void registerURLSchemeAsNotAllowingJavascriptURLs(const String& scheme);
     static bool shouldTreatURLSchemeAsNotAllowingJavascriptURLs(const String& scheme);
 
-    // Let some schemes opt-out of Private Browsing's default behavior of prohibiting read/write
-    // access to Local Storage and Databases.
-    static void registerURLSchemeAsAllowingLocalStorageAccessInPrivateBrowsing(const String& scheme);
-    static bool allowsLocalStorageAccessInPrivateBrowsing(const String& scheme);
-    static void registerURLSchemeAsAllowingDatabaseAccessInPrivateBrowsing(const String& scheme);
-    static bool allowsDatabaseAccessInPrivateBrowsing(const String& scheme);
-
     // Allow non-HTTP schemes to be registered to allow CORS requests.
     static void registerURLSchemeAsCORSEnabled(const String& scheme);
     static bool shouldTreatURLSchemeAsCORSEnabled(const String& scheme);