Delete unreachable code in library.

sdk/lib/io/link.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.io;
 
 /**
  * [Link] objects are references to filesystem links.
  *
  */
@@ skipping 164 matching lines @@
     Uri link = new Uri.file(path);
     Uri destination = new Uri.file(target);
     String result = base.resolveUri(link).resolveUri(destination).toFilePath();
     if (result.length > 3 && result[1] == ':' && result[2] == '\\') {
       return '\\??\\$result';
     } else {
       throw new LinkException(
           'Target $result of Link.create on Windows cannot be converted' +
           ' to start with a drive letter.  Unexpected error.');
     }
-    return target;
   }
 
   void updateSync(String target) {
     // TODO(12414): Replace with atomic update, where supported by platform.
     // Atomically changing a link can be done by creating the new link, with
     // a different name, and using the rename() posix call to move it to
     // the old name atomically.
     deleteSync();
     createSync(target);
   }
@@ skipping 123 matching lines @@
       if (path != null) {
         sb.write(", path = $path");
       }
     }
     return sb.toString();
   }
   final String message;
   final String path;
   final OSError osError;
 }