Remove support for the old Span classes from source_maps.

This releases source_maps 0.10.0, code_transformers 0.2.0+2, observe 0.11.0+3,
and polymer 0.12.0+4.

BUG=19930
R=sigmund@google.com

Review URL: https://codereview.chromium.org//421723004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/source_maps@38803 260f80e4-7a28-3924-810f-c04153c831b5
16 files changed
tree: 34f135567eb69b4eb1109a8da3a605cbf42280b1
  1. pkgs/