This CL replaces user_manager::UserID with AccountId.

chrome/browser/ui/ash/multi_user/multi_user_context_menu_chromeos.cc

 // Copyright 2013 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/ui/ash/multi_user/multi_user_context_menu.h"
 
 #include "ash/multi_profile_uma.h"
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_util.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_warning_dialog.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
+#include "components/signin/core/account_id/account_id.h"
 #include "components/user_manager/user.h"
 #include "components/user_manager/user_manager.h"
 #include "ui/aura/window.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/models/simple_menu_model.h"
 
 namespace chromeos {
 
 namespace {
 
@@ skipping 56 matching lines @@
                                     : IDC_VISIT_DESKTOP_OF_LRU_USER_3,
                     l10n_util::GetStringFUTF16(
                         IDS_VISIT_DESKTOP_OF_LRU_USER,
                         user_info->GetDisplayName(),
                         base::ASCIIToUTF16(user_info->GetEmail())));
     }
   }
   return model.Pass();
 }
 
-void OnAcceptTeleportWarning(const std::string& user_id,
+void OnAcceptTeleportWarning(const AccountId& account_id,
                              aura::Window* window_,
                              bool no_show_again) {
   PrefService* pref = ProfileManager::GetActiveUserProfile()->GetPrefs();
   pref->SetBoolean(prefs::kMultiProfileWarningShowDismissed, no_show_again);
 
   ash::MultiProfileUMA::RecordTeleportAction(
       ash::MultiProfileUMA::TELEPORT_WINDOW_CAPTION_MENU);
 
-  chrome::MultiUserWindowManager::GetInstance()->ShowWindowForUser(window_,
-                                                                   user_id);
+  chrome::MultiUserWindowManager::GetInstance()->ShowWindowForUser(
+      window_, account_id.GetUserEmail());
 }
 
 void ExecuteVisitDesktopCommand(int command_id, aura::Window* window) {
   switch (command_id) {
     case IDC_VISIT_DESKTOP_OF_LRU_USER_2:
     case IDC_VISIT_DESKTOP_OF_LRU_USER_3: {
       // When running the multi user mode on Chrome OS, windows can "visit"
       // another user's desktop.
-      const std::string& user_id =
+      const AccountId account_id =
           ash::Shell::GetInstance()
               ->session_state_delegate()
               ->GetUserInfo(IDC_VISIT_DESKTOP_OF_LRU_USER_2 == command_id ? 1
                                                                           : 2)
-              ->GetUserID();
+              ->GetAccountId();
       base::Callback<void(bool)> on_accept =
-          base::Bind(&OnAcceptTeleportWarning, user_id, window);
+          base::Bind(&OnAcceptTeleportWarning, account_id, window);
 
       // Don't show warning dialog if any logged in user in multi-profiles
       // session dismissed it.
       const user_manager::UserList logged_in_users =
           user_manager::UserManager::Get()->GetLoggedInUsers();
       for (user_manager::UserList::const_iterator it = logged_in_users.begin();
            it != logged_in_users.end();
            ++it) {
         if (multi_user_util::GetProfileFromUserID(
             multi_user_util::GetUserIDFromEmail((*it)->email()))->GetPrefs()->
             GetBoolean(prefs::kMultiProfileWarningShowDismissed)) {
           bool active_user_show_option =
               ProfileManager::GetActiveUserProfile()->
               GetPrefs()->GetBoolean(prefs::kMultiProfileWarningShowDismissed);
           on_accept.Run(active_user_show_option);
           return;
         }
       }
       chromeos::ShowMultiprofilesWarningDialog(on_accept);
       return;
     }
     default:
       NOTREACHED();
   }
 }