removed unused codes

modules/identity/src/Volo.Abp.Identity.Application.Contracts/Volo/Abp/Identity/GetIdentityRolesInput.cs

@@ -1,9 +0,0 @@
-using Volo.Abp.Application.Dtos;
-
-namespace Volo.Abp.Identity
-{
-    public class GetIdentityRolesInput
-    {
-
-    }
-}

modules/identity/src/Volo.Abp.Identity.HttpApi/Volo/Abp/Identity/IdentityRoleController.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Volo.Abp.Application.Dtos;