This CL replaces user_manager::UserID with AccountId.

chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.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/users/wallpaper/wallpaper_manager.h"
 
 #include <numeric>
 #include <vector>
 
 #include "ash/ash_constants.h"
@@ skipping 460 matching lines @@
   base::FilePath wallpaper_path = GetCustomWallpaperPath(
       wallpaper::kOriginalWallpaperSubDir, user_id_hash, file);
 
   // If decoded wallpaper is empty, we have probably failed to decode the file.
   // Use default wallpaper in this case.
   if (image.isNull()) {
     SetDefaultWallpaperDelayed(user_id);
     return;
   }
 
-  const user_manager::User* user =
-      user_manager::UserManager::Get()->FindUser(user_id);
+  const user_manager::User* user = user_manager::UserManager::Get()->FindUser(
+      AccountId::FromUserEmail(user_id));
   CHECK(user);
-  bool is_persistent =
+  const bool is_persistent =
       !user_manager::UserManager::Get()->IsUserNonCryptohomeDataEphemeral(
-          user_id) ||
+          AccountId::FromUserEmail(user_id)) ||
       (type == user_manager::User::POLICY &&
        user->GetType() == user_manager::USER_TYPE_PUBLIC_ACCOUNT);
 
   WallpaperInfo wallpaper_info = {
       wallpaper_path.value(),
       layout,
       type,
       // Date field is not used.
       base::Time::Now().LocalMidnight()
   };
@@ skipping 52 matching lines @@
   // in these tests anyway, avoid loading one, preventing crashes and speeding
   // up the tests.
   if (!ash::Shell::HasInstance())
     return;
 
   WallpaperResolution resolution = GetAppropriateResolution();
   const bool use_small = (resolution == WALLPAPER_RESOLUTION_SMALL);
 
   const base::FilePath* file = NULL;
 
-  const user_manager::User* user =
-      user_manager::UserManager::Get()->FindUser(user_id);
+  const user_manager::User* user = user_manager::UserManager::Get()->FindUser(
+      AccountId::FromUserEmail(user_id));
 
   if (user_manager::UserManager::Get()->IsLoggedInAsGuest()) {
     file =
         use_small ? &guest_small_wallpaper_file_ : &guest_large_wallpaper_file_;
   } else if (user && user->GetType() == user_manager::USER_TYPE_CHILD) {
     file =
         use_small ? &child_small_wallpaper_file_ : &child_large_wallpaper_file_;
   } else {
     file = use_small ? &default_small_wallpaper_file_
                      : &default_large_wallpaper_file_;
@@ skipping 46 matching lines @@
 
 void WallpaperManager::ScheduleSetUserWallpaper(const std::string& user_id,
                                                 bool delayed) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   // Some unit tests come here without a UserManager or without a pref system.q
   if (!user_manager::UserManager::IsInitialized() ||
       !g_browser_process->local_state()) {
     return;
   }
 
+  const AccountId account_id = AccountId::FromUserEmail(user_id);
   const user_manager::User* user =
-      user_manager::UserManager::Get()->FindUser(user_id);
+      user_manager::UserManager::Get()->FindUser(account_id);
 
   // User is unknown or there is no visible background in kiosk mode.
   if (!user || user->GetType() == user_manager::USER_TYPE_KIOSK_APP)
     return;
 
   // Guest user or regular user in ephemeral mode.
   if ((user_manager::UserManager::Get()->IsUserNonCryptohomeDataEphemeral(
-           user_id) &&
+           account_id) &&
        user->HasGaiaAccount()) ||
       user->GetType() == user_manager::USER_TYPE_GUEST) {
     InitInitialUserWallpaper(user_id, false);
     GetPendingWallpaper(user_id, delayed)->ResetSetDefaultWallpaper();
     return;
   }
 
   last_selected_user_ = user_id;
 
   WallpaperInfo info;
@@ skipping 156 matching lines @@
     // asynchronously once user pods are loaded.
     SetUserWallpaperDelayed(users[index]->email());
   }
 }
 
 bool WallpaperManager::GetUserWallpaperInfo(const std::string& user_id,
                                             WallpaperInfo* info) const {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   if (user_manager::UserManager::Get()->IsUserNonCryptohomeDataEphemeral(
-          user_id)) {
+          AccountId::FromUserEmail(user_id))) {
     // Default to the values cached in memory.
     *info = current_user_wallpaper_info_;
 
     // Ephemeral users do not save anything to local state. But we have got
     // wallpaper info from memory. Returns true.
     return true;
   }
 
   const base::DictionaryValue* info_dict;
   if (!g_browser_process->local_state()
@@ skipping 208 matching lines @@
     }
   }
 
   if (need_update_screen) {
     DoSetDefaultWallpaper(std::string(),
                           MovableOnDestroyCallbackHolder().Pass());
   }
 }
 
 }  // namespace chromeos