Remove unused using statements.

Author: hikalkan

aspnet-core/src/AbpCompanyName.AbpProjectName.Web.Mvc/Views/Shared/_Layout.cshtml

@@ -1,8 +1,6 @@
 @using System.Globalization
 @using Abp.Web.Security.AntiForgery
-@using System.Threading
 @using Abp.Configuration.Startup
-@using Abp.Timing
 @using AbpCompanyName.AbpProjectName.Web.Resources
 @inject AbpCompanyName.AbpProjectName.Timing.AppTimes AppTimes
 @inject IAbpAntiForgeryManager AbpAntiForgeryManager