Revert "Add UFCS privacy test."

This reverts commit b3e1aca40f.

src/test/compile-fail/privacy-ufcs.rs

@@ -1,24 +0,0 @@
-// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// Test to ensure private traits are inaccessible with UFCS angle-bracket syntax.
-
-mod foo {
-    trait Bar {
-        fn baz() {}
-    }
-
-    impl Bar for i32 {}
-}
-
-fn main() {
-    <i32 as ::foo::Bar>::baz(); //~ERROR method `baz` is inaccessible
-                                //~^NOTE: trait `Bar` is private
-}