sync: Introduce control data types

sync/internal_api/public/sync_encryption_handler.cc

 // 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.
 
 #include "sync/internal_api/public/sync_encryption_handler.h"
 
 namespace syncer {
 
 SyncEncryptionHandler::Observer::Observer() {}
 SyncEncryptionHandler::Observer::~Observer() {}
 
 SyncEncryptionHandler::SyncEncryptionHandler() {}
 SyncEncryptionHandler::~SyncEncryptionHandler() {}
 
 // Static.
 ModelTypeSet SyncEncryptionHandler::SensitiveTypes() {
-  // Both of these have their own encryption schemes, but we include them
-  // anyways.
+  // It has its own encryption scheme, but we include it anyway.
   ModelTypeSet types;
   types.Put(PASSWORDS);
-  types.Put(NIGORI);
   return types;
 }
 
 }  // namespace syncer