This CL replaces e-mail with AccountId in easy signin code.

chrome/browser/chromeos/login/supervised/supervised_user_creation_screen.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/supervised/supervised_user_creation_screen.h"
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/shell.h"
 #include "base/rand_util.h"
 #include "base/values.h"
@@ skipping 198 matching lines @@
       ->GetSessionManagerClient()
       ->NotifySupervisedUserCreationFinished();
   controller_->FinishCreation();
 }
 
 void SupervisedUserCreationScreen::HideFlow() {
   Hide();
 }
 
 void SupervisedUserCreationScreen::AuthenticateManager(
-    const std::string& manager_id,
+    const AccountId& manager_id,
     const std::string& manager_password) {
   if (manager_signin_in_progress_)
     return;
   manager_signin_in_progress_ = true;
 
   UserFlow* flow = new SupervisedUserCreationFlow(manager_id);
-  ChromeUserManager::Get()->SetUserFlow(AccountId::FromUserEmail(manager_id),
-                                        flow);
+  ChromeUserManager::Get()->SetUserFlow(manager_id, flow);
 
   // Make sure no two controllers exist at the same time.
   controller_.reset();
 
   controller_.reset(new SupervisedUserCreationControllerNew(this, manager_id));
 
-  UserContext user_context(AccountId::FromUserEmail(manager_id));
+  UserContext user_context(manager_id);
   user_context.SetKey(Key(manager_password));
   ExistingUserController::current_controller()->Login(user_context,
                                                       SigninSpecifics());
 }
 
 void SupervisedUserCreationScreen::CreateSupervisedUser(
     const base::string16& display_name,
     const std::string& supervised_user_password) {
   DCHECK(controller_.get());
   int image;
@@ skipping 379 matching lines @@
     selected_image_ = user_manager::User::USER_IMAGE_EXTERNAL;
   } else {
     NOTREACHED() << "Unexpected image type: " << image_type;
   }
 }
 
 void SupervisedUserCreationScreen::OnImageAccepted() {
 }
 
 }  // namespace chromeos