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

chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.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/webui/chromeos/login/gaia_screen_handler.h"
 
 #include "ash/system/chromeos/devicetype_utils.h"
 #include "base/bind.h"
 #include "base/guid.h"
 #include "base/logging.h"
@@ skipping 723 matching lines @@
 
   std::string active_network_path = network_state_informer_->network_path();
   if (gaia_silent_load_ &&
       (network_state_informer_->state() != NetworkStateInformer::ONLINE ||
        gaia_silent_load_network_ != active_network_path)) {
     // Network has changed. Force Gaia reload.
     gaia_silent_load_ = false;
   }
 
   // Note that LoadAuthExtension clears |populated_email_|.
-  if (populated_email_.empty())
+  if (populated_email_.empty()) {
     Delegate()->LoadSigninWallpaper();
-  else
-    Delegate()->LoadWallpaper(populated_email_);
+  } else {
+    Delegate()->LoadWallpaper(
+        user_manager::UserManager::Get()->GetKnownUserAccountId(
+            populated_email_, std::string()));
+  }
 
   input_method::InputMethodManager* imm =
       input_method::InputMethodManager::Get();
 
   scoped_refptr<input_method::InputMethodManager::State> gaia_ime_state =
       imm->GetActiveIMEState()->Clone();
   imm->SetState(gaia_ime_state);
 
   // Set Least Recently Used input method for the user.
   if (!populated_email_.empty()) {
@@ skipping 119 matching lines @@
 bool GaiaScreenHandler::IsRestrictiveProxy() const {
   return !disable_restrictive_proxy_check_for_test_ &&
          !IsOnline(captive_portal_status_);
 }
 
 void GaiaScreenHandler::DisableRestrictiveProxyCheckForTest() {
   disable_restrictive_proxy_check_for_test_ = true;
 }
 
 }  // namespace chromeos