Remove Encoding-enum from dart:io and add interface in dart:convert.

BUG= http://dartbug.com/6284
BUG= http://dartbug.com/7966
R=nweiz@google.com, sgjesse@google.com

Review URL: https://codereview.chromium.org//22872012

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/http@26632 260f80e4-7a28-3924-810f-c04153c831b5
7 files changed
tree: 563da337c5593fa8c0bfd01c11ab05be2b5cbfab
  1. lib/
  2. test/
  3. pubspec.yaml