Remove AsyncError with Expando.

Review URL: https://codereview.chromium.org//14251006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@21498 260f80e4-7a28-3924-810f-c04153c831b5
3 files changed
tree: cd7ab5ffd0644f6d8cce1317b229e3c2a05b7a32
  1. lib/
  2. test/
  3. pubspec.yaml