Remove dead code.

Ix.NET/Source/System.Interactive.Async.Tests/System/Linq/Operators/Never.cs

@@ -19,9 +19,5 @@ namespace Tests
             Assert.False(e.MoveNextAsync().IsCompleted); // Very rudimentary check
             await e.DisposeAsync();
         }
-
-        private void Nop(object o)
-        {
-        }
     }
 }