Using NullLogger types from Logging.Abstractions

Author: ajaybhargavb

test/Microsoft.AspNetCore.StaticFiles.Tests/StaticFileContextTest.cs

@@ -7,7 +7,7 @@
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.FileProviders;
-using Microsoft.Extensions.Logging.Testing;
+using Microsoft.Extensions.Logging.Abstractions;
 using Microsoft.Extensions.Primitives;
 using Xunit;