Remove per-tab preference machinery.

chrome/browser/prefs/pref_service.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This provides a way to access the application's current preferences.
 
 // Chromium settings and storage represent user-selected preferences and
 // information and MUST not be extracted, overwritten or modified except
 // through Chromium defined APIs.
 
@@ skipping 143 matching lines @@
   static PrefService* CreatePrefService(const FilePath& pref_filename,
                                         PrefStore* extension_pref_store,
                                         bool async);
 
   // Creates an incognito copy of the pref service that shares most pref stores
   // but uses a fresh non-persistent overlay for the user pref store and an
   // individual extension pref store (to cache the effective extension prefs for
   // incognito windows).
   PrefService* CreateIncognitoPrefService(PrefStore* incognito_extension_prefs);
 
-  // Creates a per-tab copy of the pref service that shares most pref stores
-  // and allows WebKit-related preferences to be overridden on per-tab basis.
-  PrefService* CreatePrefServiceWithPerTabPrefStore();
-
   virtual ~PrefService();
 
   // Reloads the data from file. This should only be called when the importer
   // is running during first run, and the main process may not change pref
   // values while the importer process is running. Returns true on success.
   bool ReloadPersistentPrefs();
 
   // Returns true if the preference for the given preference name is available
   // and is managed.
   bool IsManagedPreference(const char* pref_name) const;
@@ skipping 235 matching lines @@
 
   // Whether CreateIncognitoPrefService() or
   // CreatePrefServiceWithPerTabPrefStore() have been called to create a
   // "forked" PrefService.
   bool pref_service_forked_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefService);
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_SERVICE_H_