FX_NO_OPERATION_CANCELLED --- dead code removal

src/fsharp/FSharp.Core.Unittests/FSharp.Core/Microsoft.FSharp.Control/AsyncModule.fs

@@ -325,11 +325,7 @@ type AsyncModule() =
         try
             Async.RunSynchronously (go, cancellationToken = cts.Token)
         with
-#if FX_NO_OPERATION_CANCELLED
-            _ -> ()
-#else
             :? System.OperationCanceledException -> ()
-#endif
         Assert.AreEqual(1, !flag)
 
     [<Test>]
@@ -548,11 +544,7 @@ type AsyncModule() =
                   |> fun c -> Async.RunSynchronously(c, cancellationToken = cts.Token)
                   |> ignore
             with
-#if FX_NO_OPERATION_CANCELLED
-                _ -> ()
-#else
                 :? System.OperationCanceledException -> () // OK
-#endif
         for _ in 1..1000 do test()
 
     [<Test>]

src/fsharp/FSharp.Core/control.fs

@@ -28,13 +28,6 @@ namespace Microsoft.FSharp.Control
 #endif
 
 
-
-#if FX_NO_OPERATION_CANCELLED
-    type OperationCanceledException(s : System.String) =
-        inherit System.Exception(s)
-        new () = new OperationCanceledException("The operation has been canceled")
-#endif
-
     /// We use our own internal implementation of queues to avoid a dependency on System.dll
     type Queue<'T>() =  //: IEnumerable<T>, ICollection, IEnumerable
     

src/fsharp/FSharp.Core/control.fsi

@@ -12,13 +12,6 @@ namespace Microsoft.FSharp.Control
     open Microsoft.FSharp.Control
     open Microsoft.FSharp.Collections
 
-#if FX_NO_OPERATION_CANCELLED
-
-    type OperationCanceledException =
-        inherit System.Exception
-        new : System.String -> OperationCanceledException
-#endif
-
 
     /// <summary>A compositional asynchronous computation, which, when run, will eventually produce a value 
     /// of type T, or else raises an exception.</summary>