Add missing using.

src/Microsoft.AspNet.Server.WebListener/FeatureContext.cs

@@ -422,7 +422,6 @@ namespace Microsoft.AspNet.Server.WebListener
             set { _user = value; }
         }
 
-        // TODO: Hook this server up as the default handler, have it issue challenges for configured auth types by name.
         IAuthenticationHandler IHttpAuthenticationFeature.Handler
         {
             get { return _authHandler; }

src/Microsoft.Net.Server/RequestProcessing/Request.cs

@@ -32,6 +32,7 @@ using System.Security.Cryptography.X509Certificates;
 #if NET45
 using System.Security.Principal;
 #endif
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace Microsoft.Net.Server