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

ash/login/lock_screen_controller.cc

 // 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.
 
 #include "ash/login/lock_screen_controller.h"
 
 #include "ash/login/ui/lock_screen.h"
 #include "chromeos/cryptohome/system_salt_getter.h"
 #include "chromeos/login/auth/user_context.h"
 
@@ skipping 36 matching lines @@
 void LockScreenController::HideUserPodCustomIcon(const AccountId& account_id) {
   NOTIMPLEMENTED();
 }
 
 void LockScreenController::SetAuthType(const AccountId& account_id,
                                        mojom::AuthType auth_type,
                                        const base::string16& initial_value) {
   NOTIMPLEMENTED();
 }
 
-void LockScreenController::LoadUsers(std::unique_ptr<base::ListValue> users,
+void LockScreenController::LoadUsers(std::vector<mojom::LoginUserInfoPtr> users,
                                      bool show_guest) {
   NOTIMPLEMENTED();
 }
 
 void LockScreenController::AuthenticateUser(
     const AccountId& account_id,
     const std::string& password,
     bool authenticated_by_pin,
     mojom::LockScreenClient::AuthenticateUserCallback callback) {
   if (!lock_screen_client_)
@@ skipping 42 matching lines @@
   key.Transform(chromeos::Key::KEY_TYPE_SALTED_SHA256_TOP_HALF, system_salt);
   lock_screen_client_->AuthenticateUser(
       account_id, key.GetSecret(), authenticated_by_pin, std::move(callback));
 }
 
 void LockScreenController::OnGetSystemSalt(const std::string& system_salt) {
   std::move(pending_user_auth_).Run(system_salt);
 }
 
 }  // namespace ash