Remove PrefService::ScheduleSavePersistentPrefs and SavePersistentPrefs.

chrome/browser/extensions/extension_prefs.h

Index: chrome/browser/extensions/extension_prefs.h
diff --git a/chrome/browser/extensions/extension_prefs.h b/chrome/browser/extensions/extension_prefs.h
index 9a99a25da2eb2328ff46e21142d6c1cce345d0be..5573f183fca9358bf37601c8dd50091acb8fce14 100644
--- a/chrome/browser/extensions/extension_prefs.h
+++ b/chrome/browser/extensions/extension_prefs.h
@@ -529,11 +529,6 @@ class ExtensionPrefs : public ExtensionContentSettingsStore::Observer {
       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.