Remove deprecated Strings class.

Review URL: https://codereview.chromium.org//12295014

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/yaml@18686 260f80e4-7a28-3924-810f-c04153c831b5
2 files changed
tree: 87ce997835d5a4b2d90d134934cef287071351f9
  1. pkgs/