Create Mojo Struct for user information used in login/lock screen.

ash/login/lock_screen_controller.h

 // Copyright 2017 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 ASH_LOGIN_LOCK_SCREEN_CONTROLLER_H_
 #define ASH_LOGIN_LOCK_SCREEN_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/public/interfaces/lock_screen.mojom.h"
 #include "base/macros.h"
@@ skipping 24 matching lines @@
                         const std::string& error_text,
                         const std::string& help_link_text,
                         int32_t help_topic_id) override;
   void ClearErrors() override;
   void ShowUserPodCustomIcon(const AccountId& account_id,
                              mojom::UserPodCustomIconOptionsPtr icon) override;
   void HideUserPodCustomIcon(const AccountId& account_id) override;
   void SetAuthType(const AccountId& account_id,
                    mojom::AuthType auth_type,
                    const base::string16& initial_value) override;
-  void LoadUsers(std::unique_ptr<base::ListValue> users,
+  void LoadUsers(std::vector<mojom::LoginUserInfoPtr> users,
                  bool show_guest) override;
 
   // Wrappers around the mojom::LockScreenClient interface.
   // Hash the password and send AuthenticateUser request to LockScreenClient.
   // LockScreenClient(chrome) will do the authentication and request to show
   // error messages in the lock screen if auth fails, or request to clear
   // errors if auth succeeds.
   void AuthenticateUser(
       const AccountId& account_id,
       const std::string& password,
@@ skipping 24 matching lines @@
 
   // User authentication call that will run when we have system salt.
   PendingAuthenticateUserCall pending_user_auth_;
 
   DISALLOW_COPY_AND_ASSIGN(LockScreenController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_LOGIN_LOCK_SCREEN_CONTROLLER_H_