Change "FormatException.position" to be named "offset".

Address comments on SpanFormatException changes.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//396603003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/source_maps@38373 260f80e4-7a28-3924-810f-c04153c831b5
3 files changed
tree: 527b768c7f21af8c8f889bc6f643652fe477c7b7
  1. pkgs/