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

chrome/browser/chromeos/login/supervised/supervised_user_creation_screen.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SUPERVISED_SUPERVISED_USER_CREATION_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SUPERVISED_SUPERVISED_USER_CREATION_SCREEN_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 70 matching lines @@
   std::string GetName() const override;
 
   // SupervisedUserCreationScreenHandler::Delegate implementation:
   void OnActorDestroyed(SupervisedUserCreationScreenHandler* actor) override;
   void CreateSupervisedUser(
       const base::string16& display_name,
       const std::string& supervised_user_password) override;
   void ImportSupervisedUser(const std::string& user_id) override;
   void ImportSupervisedUserWithPassword(const std::string& user_id,
                                         const std::string& password) override;
-  void AuthenticateManager(const std::string& manager_id,
+  void AuthenticateManager(const AccountId& manager_id,
                            const std::string& manager_password) override;
   void AbortFlow() override;
   void FinishFlow() override;
   void HideFlow() override;
   bool FindUserByDisplayName(const base::string16& display_name,
                              std::string* out_id) const override;
   void OnPageSelected(const std::string& page) override;
 
   // SupervisedUserController::StatusConsumer overrides.
   void OnCreationError(
@@ skipping 42 matching lines @@
 
   base::WeakPtrFactory<SupervisedUserCreationScreen> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SupervisedUserCreationScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SUPERVISED_SUPERVISED_USER_CREATION_SCREEN_H_