Remove Apple's unused implementation of private browsing from WebCore

Tools/DumpRenderTree/chromium/TestRunner/src/TestRunner.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2010 Pawel Hajdan (phajdan.jr@chromium.org)
  * Copyright (C) 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
@@ skipping 295 matching lines @@
     bindMethod("simulateWebNotificationClick", &TestRunner::notImplemented);
     bindMethod("setIconDatabaseEnabled", &TestRunner::notImplemented);
     bindMethod("setScrollbarPolicy", &TestRunner::notImplemented);
     bindMethod("clearAllApplicationCaches", &TestRunner::notImplemented);
     bindMethod("clearApplicationCacheForOrigin", &TestRunner::notImplemented);
     bindMethod("clearBackForwardList", &TestRunner::notImplemented);
     bindMethod("keepWebHistory", &TestRunner::notImplemented);
     bindMethod("setApplicationCacheOriginQuota", &TestRunner::notImplemented);
     bindMethod("setCallCloseOnWebViews", &TestRunner::notImplemented);
     bindMethod("setMainFrameIsFirstResponder", &TestRunner::notImplemented);
-    bindMethod("setPrivateBrowsingEnabled", &TestRunner::notImplemented);
     bindMethod("setUseDashboardCompatibilityMode", &TestRunner::notImplemented);
     bindMethod("deleteAllLocalStorage", &TestRunner::notImplemented);
     bindMethod("localStorageDiskUsageForOrigin", &TestRunner::notImplemented);
     bindMethod("originsWithLocalStorage", &TestRunner::notImplemented);
     bindMethod("deleteLocalStorageForOrigin", &TestRunner::notImplemented);
     bindMethod("observeStorageTrackerNotifications", &TestRunner::notImplemented);
     bindMethod("syncLocalStorage", &TestRunner::notImplemented);
     bindMethod("addDisallowedURL", &TestRunner::notImplemented);
     bindMethod("applicationCacheDiskUsageForOrigin", &TestRunner::notImplemented);
     bindMethod("abortModal", &TestRunner::notImplemented);
@@ skipping 1716 matching lines @@
     result->setNull();
 }
 
 void TestRunner::setPointerLockWillFailSynchronously(const CppArgumentList&, CppVariant* result)
 {
     m_pointerLockPlannedResult = PointerLockWillFailSync;
     result->setNull();
 }
 
 }