Fixes source map bug: getLocationMessage was incorrect on file segments

R=jmesserly@google.com

Review URL: https://codereview.chromium.org//18083030

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/source_maps@24759 260f80e4-7a28-3924-810f-c04153c831b5
2 files changed
tree: ff6f59bdd7db62c209364d2f30f0a12375f491bb
  1. pkgs/