[master] Update dependencies from aspnet/Extensions (dotnet/aspnetcore-tooling#970)

* Update dependencies from https://github.com/aspnet/Extensions build 20190813.3

- Microsoft.AspNetCore.BenchmarkRunner.Sources - 5.0.0-alpha1.19413.3
- Microsoft.AspNetCore.Testing - 5.0.0-alpha1.19413.3
- Microsoft.Extensions.CommandLineUtils.Sources - 5.0.0-alpha1.19413.3
- Microsoft.Extensions.HashCodeCombiner.Sources - 5.0.0-alpha1.19413.3
- Microsoft.Extensions.NonCapturingTimer.Sources - 5.0.0-alpha1.19413.3
- Microsoft.Extensions.Logging - 5.0.0-alpha1.19413.3

* Update dependencies from https://github.com/aspnet/Extensions build 20190816.10

- Microsoft.AspNetCore.BenchmarkRunner.Sources - 5.0.0-alpha1.19416.10
- Microsoft.AspNetCore.Testing - 5.0.0-alpha1.19416.10
- Microsoft.Extensions.CommandLineUtils.Sources - 5.0.0-alpha1.19416.10
- Microsoft.Extensions.HashCodeCombiner.Sources - 5.0.0-alpha1.19416.10
- Microsoft.Extensions.NonCapturingTimer.Sources - 5.0.0-alpha1.19416.10
- Microsoft.Extensions.Logging - 5.0.0-alpha1.19416.10

Dependency coherency updates

- System.Diagnostics.DiagnosticSource - 5.0.0-alpha1.19409.9 (parent: Microsoft.NETCore.App.Runtime.win-x64)
- Microsoft.NETCore.App.Runtime.win-x64 - 5.0.0-alpha1.19411.12 (parent: Microsoft.Extensions.Logging)
- System.Reflection.Metadata - 1.8.0-alpha1.19409.9 (parent: Microsoft.NETCore.App.Runtime.win-x64)
- System.Text.Encodings.Web - 5.0.0-alpha1.19409.9 (parent: Microsoft.NETCore.App.Runtime.win-x64)
- Microsoft.Extensions.DependencyModel - 5.0.0-alpha1.19411.12 (parent: Microsoft.Extensions.Logging)
- Microsoft.NETCore.App.Ref - 5.0.0-alpha1.19411.12 (parent: Microsoft.Extensions.Logging)
- Microsoft.NETCore.Platforms - 5.0.0-alpha1.19409.9 (parent: Microsoft.NETCore.App.Runtime.win-x64)

* * React to namespace removal
- a portion of [release/3.0] Update dependencies from aspnet/Extensions (dotnet/aspnetcore-tooling#975)
- w/ thanks to @jkotalik !
\n\nCommit migrated from a988d3e05d

src/Razor/Microsoft.AspNetCore.Razor.Language/test/DefaultRazorProjectFileSystemTest.cs

@@ -5,7 +5,6 @@ using System;
 using System.IO;
 using System.Linq;
 using Microsoft.AspNetCore.Testing;
-using Microsoft.AspNetCore.Testing.xunit;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Razor.Language

src/Razor/Microsoft.AspNetCore.Razor.Tools/test/ServerLifecycleTest.cs

@@ -7,7 +7,7 @@ using System.Diagnostics;
 using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Testing.xunit;
+using Microsoft.AspNetCore.Testing;
 using Moq;
 using Xunit;
 

src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/ApplicationPartDiscoveryIntegrationTest.cs

@@ -3,7 +3,7 @@
 
 using System.IO;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Testing.xunit;
+using Microsoft.AspNetCore.Testing;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Razor.Design.IntegrationTests

src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/BuildIncrementalismTest.cs

@@ -7,7 +7,7 @@ using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Testing.xunit;
+using Microsoft.AspNetCore.Testing;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Razor.Design.IntegrationTests

src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/BuildIntegrationTest.cs

@@ -7,7 +7,7 @@ using System.Linq;
 using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
-using Microsoft.AspNetCore.Testing.xunit;
+using Microsoft.AspNetCore.Testing;
 using Microsoft.Extensions.DependencyModel;
 using Xunit;
 

src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/BuildIntegrationTest11.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Testing.xunit;
+using Microsoft.AspNetCore.Testing;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Razor.Design.IntegrationTests

src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/BuildIntegrationTest22NetFx.cs

@@ -4,7 +4,7 @@
 using System;
 using System.IO;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Testing.xunit;
+using Microsoft.AspNetCore.Testing;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Razor.Design.IntegrationTests

src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/BuildServerIntegrationTest.cs

@@ -7,7 +7,6 @@ using System.IO;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Testing;
-using Microsoft.AspNetCore.Testing.xunit;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Razor.Design.IntegrationTests

src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/BuildWithComponentsIntegrationTest.cs

@@ -3,7 +3,7 @@
 
 using System.IO;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Testing.xunit;
+using Microsoft.AspNetCore.Testing;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Razor.Design.IntegrationTests