Cleans up some usings with System.Web

src/Umbraco.Core/ContentExtensions.cs

@@ -7,14 +7,11 @@ using System.Web;
 using System.Xml.Linq;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
-using NPoco.Expressions;
 using Umbraco.Core.Composing;
 using Umbraco.Core.IO;
 using Umbraco.Core.Models;
-using Umbraco.Core.Models.Entities;
 using Umbraco.Core.Models.Membership;
 using Umbraco.Core.Services;
-using Umbraco.Core.Services.Implement;
 
 namespace Umbraco.Core
 {

src/Umbraco.Core/EmailSender.cs

@@ -1,9 +1,7 @@
 using System;
 using System.Net.Mail;
 using System.Threading.Tasks;
-using System.Web;
 using Umbraco.Core.Composing;
-using Umbraco.Core.Configuration;
 using Umbraco.Core.Events;
 
 namespace Umbraco.Core

src/Umbraco.Core/PropertyEditors/ValueConverters/GridValueConverter.cs

@@ -1,14 +1,9 @@
 using System;
-using System.Collections.Generic;
-using System.IO;
 using System.Linq;
-using System.Web;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
-using Umbraco.Core.Configuration;
 using Umbraco.Core.Composing;
 using Umbraco.Core.Configuration.Grid;
-using Umbraco.Core.IO;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Models.PublishedContent;