Remove run-pass/issue-3907-2.rs

This test is not supposed to compile; there is an equivalent test in compile-fail/issue-3907.rs.

src/test/run-pass/issue-3907-2.rs

@@ -1,30 +0,0 @@
-// Copyright 2013 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.
-
-// xfail-test
-// aux-build:issue_3907_1.rs
-extern mod issue_3907_1;
-
-type Foo = issue_3907_1::Foo;
-
-struct S {
-    name: int
-}
-
-impl Foo for S {
-    fn bar() { }
-}
-
-fn main() {
-    let s = S {
-        name: 0
-    };
-    s.bar();
-}