Remove PrefService::ScheduleSavePersistentPrefs and SavePersistentPrefs.

chrome/browser/extensions/extension_prefs.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 511 matching lines @@
   // exist.
   const base::DictionaryValue* GetExtensionPref(const std::string& id) const;
 
   // Returns the dictionary of preferences controlled by the specified extension
   // or creates a new one. All entries in the dictionary contain non-expanded
   // paths.
   const base::DictionaryValue* GetExtensionControlledPrefs(
       const std::string& id,
       bool incognito) const;
 
-  // Serializes the data and schedules a persistent save via the |PrefService|.
-  // TODO(andybons): Fire an EXTENSION_PREF_CHANGED notification to be more
-  // granular than PREF_CHANGED.
-  void SavePrefs();
-
   // Checks if kPrefBlacklist is set to true in the DictionaryValue.
   // Return false if the value is false or kPrefBlacklist does not exist.
   // This is used to decide if an extension is blacklisted.
   static bool IsBlacklistBitSet(base::DictionaryValue* ext);
 
   // Fix missing preference entries in the extensions that are were introduced
   // in a later Chrome version.
   void FixMissingPrefs(const ExtensionIdSet& extension_ids);
 
   // Installs the persistent extension preferences into |prefs_|'s extension
@@ skipping 51 matching lines @@
 
   // Weak pointer, owned by Profile.
   ExtensionPrefValueMap* extension_pref_value_map_;
 
   scoped_refptr<ExtensionContentSettingsStore> content_settings_store_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrefs);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_