This CL replaces e-mail with AccountId on user selection screen.

chrome/browser/chromeos/login/screens/user_selection_screen.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 "chrome/browser/chromeos/login/screens/user_selection_screen.h"
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/values.h"
@@ skipping 130 matching lines @@
     bool is_signin_to_add,
     AuthType auth_type,
     const std::vector<std::string>* public_session_recommended_locales,
     base::DictionaryValue* user_dict) {
   const bool is_public_session =
       user->GetType() == user_manager::USER_TYPE_PUBLIC_ACCOUNT;
   const bool is_legacy_supervised_user =
       user->GetType() == user_manager::USER_TYPE_SUPERVISED;
   const bool is_child_user = user->GetType() == user_manager::USER_TYPE_CHILD;
 
-  user_dict->SetString(kKeyUsername, user->GetAccountId().GetUserEmail());
+  user_dict->SetString(kKeyUsername, user->GetAccountId().Serialize());
   user_dict->SetString(kKeyEmailAddress, user->display_email());
   user_dict->SetString(kKeyDisplayName, user->GetDisplayName());
   user_dict->SetBoolean(kKeyPublicAccount, is_public_session);
   user_dict->SetBoolean(kKeyLegacySupervisedUser, is_legacy_supervised_user);
   user_dict->SetBoolean(kKeyChildUser, is_child_user);
   user_dict->SetBoolean(kKeyDesktopUser, false);
   user_dict->SetInteger(kKeyInitialAuthType, auth_type);
   user_dict->SetBoolean(kKeySignedIn, user->is_logged_in());
   user_dict->SetBoolean(kKeyIsOwner, is_owner);
 
@@ skipping 388 matching lines @@
   // The user profile should exist if and only if this is the lock screen.
   DCHECK_EQ(!!profile, GetScreenType() == LOCK_SCREEN);
 
   if (!profile)
     profile = profile_helper->GetSigninProfile();
 
   return EasyUnlockService::Get(profile);
 }
 
 }  // namespace chromeos