Remove workaround for issue #1494

We have a snapshot that includes the fix.

src/libstd/test.rs

@@ -4,6 +4,7 @@
 // while providing a base that other test frameworks may build off of.
 
 import result::{ok, err};
+import io::writer_util;
 
 export test_name;
 export test_fn;
@@ -30,13 +31,6 @@ native mod rustrt {
     fn sched_threads() -> uint;
 }
 
-// FIXME Kludge to work around issue #1494 . Simply import io::writer_util
-// after the next snapshot.
-impl writer_util for io::writer {
-    fn write_str(s: str) { self.write(str::bytes(s)); }
-    fn write_line(s: str) { self.write(str::bytes(s + "\n")); }
-}
-
 // The name of a test. By convention this follows the rules for rust
 // paths; i.e. it should be a series of identifiers seperated by double
 // colons. This way if some test runner wants to arrange the tests