ExtensionPrefs: remove MigratePermissions

extensions/browser/extension_prefs.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_EXTENSION_PREFS_H_
 #define EXTENSIONS_BROWSER_EXTENSION_PREFS_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 612 matching lines @@
                             DisableReasonChange change);
 
   // Fix missing preference entries in the extensions that are were introduced
   // in a later Chrome version.
   void FixMissingPrefs(const ExtensionIdList& extension_ids);
 
   // Installs the persistent extension preferences into |prefs_|'s extension
   // pref store. Does nothing if extensions_disabled_ is true.
   void InitPrefStore();
 
-  // Migrates the permissions data in the pref store.
-  void MigratePermissions(const ExtensionIdList& extension_ids);
-
   // Checks whether there is a state pref for the extension and if so, whether
   // it matches |check_state|.
   bool DoesExtensionHaveState(const std::string& id,
                               Extension::State check_state) const;
 
   // Reads the list of strings for |pref| from user prefs into
   // |id_container_out|. Returns false if the pref wasn't found in the user
   // pref store.
   template <class ExtensionIdContainer>
   bool GetUserExtensionPrefIntoContainer(
@@ skipping 47 matching lines @@
   bool extensions_disabled_;
 
   base::ObserverList<ExtensionPrefsObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrefs);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_PREFS_H_