Change Directory.list to use the input path, and not resolve it to a full path.

tests/standalone/io/file_system_links_test.dart

 // Copyright (c) 2012, 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.
 
 import "dart:io";
 
 
 createLink(String dst, String link, bool symbolic, void callback()) {
   var args = [ symbolic ? '-s' : '', dst, link ];
   var script = 'tests/standalone/io/ln.sh';
@@ skipping 118 matching lines @@
     var dirs = [];
     for (var entry in temp.listSync(recursive:true)) {
       if (entry is File) {
         files.add(entry.name);
       } else {
         Expect.isTrue(entry is Directory);
         dirs.add(entry.path);
       }
     }
     Expect.equals(1, files.length);
-    Expect.isTrue(files[0].endsWith(x));
+    Expect.isTrue(files[0].endsWith('$y${Platform.pathSeparator}x'));
     Expect.equals(1, dirs.length);
     Expect.isTrue(dirs[0].endsWith(y));
 
     files = [];
     dirs = [];
     var lister = temp.list(recursive: true);
     lister.onFile = (f) => files.add(f);
     lister.onDir = (d) => dirs.add(d);
     lister.onDone = (success) {
       Expect.isTrue(success);
       Expect.equals(1, files.length);
-      Expect.isTrue(files[0].endsWith(x));
+      Expect.isTrue(files[0].endsWith('$y${Platform.pathSeparator}x'));
       Expect.equals(1, dirs.length);
       Expect.isTrue(dirs[0].endsWith(y));
       temp.deleteSync(recursive: true);
       temp2.deleteSync(recursive: true);
     };
   });
 }
 
 
 testDirectoryListingBrokenLink() {
@@ skipping 27 matching lines @@
 
 main() {
   testFileExistsCreate();
   testFileDelete();
   testFileWriteRead();
   testDirectoryExistsCreate();
   testDirectoryDelete();
   testDirectoryListing();
   testDirectoryListingBrokenLink();
 }