This CL replaces user_manager::UserID with AccountId.

chrome/browser/download/notification/download_notification_browsertest.cc

 // Copyright 2015 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 "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
@@ skipping 1109 matching lines @@
   Profile* GetProfileByIndex(int index) {
     return chromeos::ProfileHelper::GetProfileByUserIdHash(
         kTestAccounts[index].hash);
   }
 
   // Adds a new user for testing to the current session.
   void AddUser(const TestAccountInfo& info, bool log_in) {
     user_manager::UserManager* const user_manager =
         user_manager::UserManager::Get();
     if (log_in)
-      user_manager->UserLoggedIn(info.email, info.hash, false);
-    user_manager->SaveUserDisplayName(info.email,
+      user_manager->UserLoggedIn(AccountId::FromUserEmail(info.email),
+                                 info.hash, false);
+    user_manager->SaveUserDisplayName(AccountId::FromUserEmail(info.email),
                                       base::UTF8ToUTF16(info.display_name));
     SigninManagerFactory::GetForProfile(
         chromeos::ProfileHelper::GetProfileByUserIdHash(info.hash))
             ->SetAuthenticatedAccountInfo(info.gaia_id, info.email);
   }
 };
 
 IN_PROC_BROWSER_TEST_F(MultiProfileDownloadNotificationTest,
                        PRE_DownloadMultipleFiles) {
   AddAllUsers();
@@ skipping 93 matching lines @@
   EXPECT_EQ(message_center::NOTIFICATION_TYPE_BASE_FORMAT,
             GetNotification(notification_id_user1)->type());
   EXPECT_EQ(message_center::NOTIFICATION_TYPE_BASE_FORMAT,
             GetNotification(notification_id_user2_1)->type());
   // Normal notifications for user2.
   EXPECT_EQ(message_center::NOTIFICATION_TYPE_BASE_FORMAT,
             GetNotification(notification_id_user2_1)->type());
   EXPECT_EQ(message_center::NOTIFICATION_TYPE_BASE_FORMAT,
             GetNotification(notification_id_user2_2)->type());
 }