Change the namespace of the extension methods (#7651)

- The other routing extension methods use Microsoft.AspNetCore.Builder

src/SignalR/common/Http.Connections/src/ConnectionEndpointRouteBuilderExtensions.cs

@@ -5,13 +5,13 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.AspNetCore.Authorization;
-using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Connections;
 using Microsoft.AspNetCore.Http.Connections;
 using Microsoft.AspNetCore.Http.Connections.Internal;
+using Microsoft.AspNetCore.Routing;
 using Microsoft.Extensions.DependencyInjection;
 
-namespace Microsoft.AspNetCore.Routing
+namespace Microsoft.AspNetCore.Builder
 {
     public static class ConnectionEndpointRouteBuilderExtensions
     {

src/SignalR/samples/SignalRSamples/Startup.cs

@@ -8,7 +8,6 @@ using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
-using Microsoft.AspNetCore.Routing;
 using Microsoft.Extensions.DependencyInjection;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;

src/SignalR/server/SignalR/src/HubEndpointRouteBuilderExtensions.cs

@@ -4,12 +4,12 @@
 using System;
 using System.Linq;
 using Microsoft.AspNetCore.Authorization;
-using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http.Connections;
+using Microsoft.AspNetCore.Routing;
 using Microsoft.AspNetCore.SignalR;
 using Microsoft.Extensions.DependencyInjection;
 
-namespace Microsoft.AspNetCore.Routing
+namespace Microsoft.AspNetCore.Builder
 {
     public static class HubEndpointRouteBuilderExtensions
     {