Pub is still all kinds of broken with this, but it's slightly
less broken. Some tests pass, and at least the code *parses*
after this.

Review URL: https://codereview.chromium.org//11785028

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@16763 260f80e4-7a28-3924-810f-c04153c831b5