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

chrome/browser/ui/ash/lock_screen_client.cc

Index: chrome/browser/ui/ash/lock_screen_client.cc
diff --git a/chrome/browser/ui/ash/lock_screen_client.cc b/chrome/browser/ui/ash/lock_screen_client.cc
index 8e0a3df4340ed8e54abe105b328e7805260443b4..c9f04ea5f0472c3e1963a0aa9d4903403a9eab56 100644
--- a/chrome/browser/ui/ash/lock_screen_client.cc
+++ b/chrome/browser/ui/ash/lock_screen_client.cc
@@ -124,8 +124,9 @@ void LockScreenClient::SetAuthType(const AccountId& account_id,
   lock_screen_->SetAuthType(account_id, auth_type, initial_value);
 }
 
-void LockScreenClient::LoadUsers(std::unique_ptr<base::ListValue> users_list,
-                                 bool show_guest) {
+void LockScreenClient::LoadUsers(
+    std::vector<ash::mojom::LoginUserInfoPtr> users_list,
+    bool show_guest) {
   lock_screen_->LoadUsers(std::move(users_list), show_guest);
 }