Fix after insertion

Author: davidwengier

src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/TestBrokeredServiceInterceptor.cs

@@ -6,7 +6,6 @@
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.ExternalAccess.Razor;
-using Microsoft.CodeAnalysis.ExternalAccess.Razor.Testing;
 using Microsoft.CodeAnalysis.Remote.Razor;
 using Xunit;