Make path_set_test use Windows-friendly paths where necessary.

R=rnystrom@google.com
BUG=

Review URL: https://codereview.chromium.org//68683004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/watcher@30171 260f80e4-7a28-3924-810f-c04153c831b5
1 file changed
tree: 66e51c31c586bb7e55a8fdea201ae3bbfc7eb8ce
  1. pkgs/