React to HttpAbstractions namespace changes

- aspnet/HttpAbstractions#549 and aspnet/HttpAbstractions#592
- clean up `using`s

Author: dougbu

src/Microsoft.AspNetCore.Identity/IdentityServiceCollectionExtensions.cs

@@ -4,7 +4,6 @@
 using System;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Http.Internal;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 
@@ -39,7 +38,7 @@ public static IdentityBuilder AddIdentity<TUser, TRole>(
         /// <param name="setupAction">An action to configure the <see cref="IdentityOptions"/>.</param>
         /// <returns>An <see cref="IdentityBuilder"/> for creating and configuring the identity system.</returns>
         public static IdentityBuilder AddIdentity<TUser, TRole>(
-            this IServiceCollection services, 
+            this IServiceCollection services,
             Action<IdentityOptions> setupAction)
             where TUser : class
             where TRole : class

test/Microsoft.AspNetCore.Identity.EntityFrameworkCore.InMemory.Test/TestIdentityFactory.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Http.Internal;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 

test/Microsoft.AspNetCore.Identity.EntityFrameworkCore.Test/DbUtil.cs

@@ -2,10 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Http.Internal;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
-using Xunit;
 
 namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore.Test
 {

test/Microsoft.AspNetCore.Identity.Test/SignInManagerTest.cs

@@ -11,7 +11,6 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Authentication;
 using Microsoft.AspNetCore.Http.Features.Authentication;
-using Microsoft.AspNetCore.Http.Internal;
 using Microsoft.Extensions.Options;
 using Moq;
 using Xunit;

test/Microsoft.AspNetCore.Identity.Test/UserManagerTest.cs

@@ -8,7 +8,6 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Http.Internal;
 using Microsoft.Extensions.DependencyInjection;
 using Moq;
 using Xunit;

test/Shared/UserManagerTestBase.cs

@@ -9,7 +9,6 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Http.Internal;
 using Microsoft.AspNetCore.Testing;
 using Microsoft.AspNetCore.Testing.xunit;
 using Microsoft.Extensions.DependencyInjection;
@@ -1023,7 +1022,7 @@ public async Task SingleFailureLockout()
             Assert.True(await mgr.IsLockedOutAsync(user));
             Assert.True(await mgr.GetLockoutEndDateAsync(user) > DateTimeOffset.UtcNow.AddMinutes(55));
             IdentityResultAssert.VerifyLogMessage(mgr.Logger, $"User {await mgr.GetUserIdAsync(user)} is locked out.");
-            
+
             Assert.Equal(0, await mgr.GetAccessFailedCountAsync(user));
         }
 
@@ -1769,7 +1768,7 @@ public async Task CanChangeEmailWithDifferentTokenProvider()
             {
                 return;
             }
-            var manager = CreateManager(context: null, services: null, 
+            var manager = CreateManager(context: null, services: null,
                 configureServices: s => s.Configure<IdentityOptions>(
                     o => o.Tokens.ProviderMap["NewProvider2"] = new TokenProviderDescriptor(typeof(EmailTokenProvider<TUser>))));
             manager.Options.Tokens.ChangeEmailTokenProvider = "NewProvider2";