Removing unused test code.

Ix.NET/Source/System.Interactive.Async.Tests/AsyncTests.Aggregates.cs

@@ -1,21 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the Apache 2.0 License.
-// See the LICENSE file in the project root for more information. 
-
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
-using Xunit;
-// ReSharper disable InvokeAsExtensionMethod
-// ReSharper disable InconsistentNaming
-// ReSharper disable RedundantTypeArgumentsOfMethod
-
-namespace Tests
-{
-    public partial class AsyncTests
-    {
-        
-    }
-}