Remove unused using

Author: davidwengier

src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Services/VSCodeRemoteServicesInitializer.cs

@@ -4,7 +4,6 @@
 using System.Composition;
 using System.Threading;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Razor;
 using Microsoft.CodeAnalysis.ExternalAccess.Razor.Cohost;
 using Microsoft.CodeAnalysis.Razor.Logging;
 using Microsoft.CodeAnalysis.Razor.Remote;