Move a number of packages and some of pub over to using source_span.

R=efortuna@google.com, rnystrom@google.com, sigmund@google.com
BUG=19930

Review URL: https://codereview.chromium.org//401753002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/yaml@38526 260f80e4-7a28-3924-810f-c04153c831b5
10 files changed
tree: a6425cd129c1ec981627c217ba11d9d56ef02540
  1. pkgs/