Implement a basic UI flow for cryptohome encryption migration.

chromeos/login/auth/auth_status_consumer.cc

 // 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.
 
 #include "chromeos/login/auth/auth_status_consumer.h"
 
 namespace chromeos {
 
 void AuthStatusConsumer::OnPasswordChangeDetected() {
   NOTREACHED();
 }
 
-void AuthStatusConsumer::OnOldEncryptionDetected() {
+void AuthStatusConsumer::OnOldEncryptionDetected(
+    const UserContext& user_context) {
   NOTREACHED();
 }
 
 }  // namespace chromeos