This CL replaces e-mail with AccountId in wallpaper manager code.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc

 // Copyright (c) 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/webui/chromeos/login/signin_screen_handler.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/shell.h"
@@ skipping 1030 matching lines @@
   gaia_screen_handler_->LoadAuthExtension(true /* force */, true /* offline */);
   UpdateUIState(UI_STATE_GAIA_SIGNIN, nullptr);
 }
 
 void SigninScreenHandler::HandleShutdownSystem() {
   ash::Shell::GetInstance()->lock_state_controller()->RequestShutdown();
 }
 
 void SigninScreenHandler::HandleLoadWallpaper(const AccountId& account_id) {
   if (delegate_)
-    delegate_->LoadWallpaper(account_id.GetUserEmail());
+    delegate_->LoadWallpaper(account_id);
 }
 
 void SigninScreenHandler::HandleRebootSystem() {
   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RequestRestart();
 }
 
 void SigninScreenHandler::HandleRemoveUser(const AccountId& account_id) {
   ProfileMetrics::LogProfileDeleteUser(
       ProfileMetrics::DELETE_PROFILE_USER_MANAGER);
 
@@ skipping 171 matching lines @@
   if (ScreenLocker::default_screen_locker())
     ScreenLocker::default_screen_locker()->UnlockOnLoginSuccess();
 }
 
 void SigninScreenHandler::HandleShowLoadingTimeoutError() {
   UpdateState(NetworkError::ERROR_REASON_LOADING_TIMEOUT);
 }
 
 void SigninScreenHandler::HandleFocusPod(const AccountId& account_id) {
   SetUserInputMethod(account_id.GetUserEmail(), ime_state_.get());
-  WallpaperManager::Get()->SetUserWallpaperDelayed(account_id.GetUserEmail());
+  WallpaperManager::Get()->SetUserWallpaperDelayed(account_id);
   proximity_auth::ScreenlockBridge::Get()->SetFocusedUser(
       account_id.GetUserEmail());
   if (delegate_)
     delegate_->CheckUserStatus(account_id);
   if (!test_focus_pod_callback_.is_null())
     test_focus_pod_callback_.Run();
 
   bool use_24hour_clock = false;
   if (user_manager::UserManager::Get()->GetKnownUserBooleanPref(
           account_id, prefs::kUse24HourClock, &use_24hour_clock)) {
@@ skipping 157 matching lines @@
   return gaia_screen_handler_->frame_error();
 }
 
 void SigninScreenHandler::OnCapsLockChanged(bool enabled) {
   caps_lock_enabled_ = enabled;
   if (page_is_ready())
     CallJS("login.AccountPickerScreen.setCapsLockState", caps_lock_enabled_);
 }
 
 }  // namespace chromeos