Reapply "Rename mappedBy to map."

This reverts commit r17907.

TBR.

Review URL: https://codereview.chromium.org//12090093

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/yaml@17918 260f80e4-7a28-3924-810f-c04153c831b5
4 files changed
tree: 4c119b36aaa3edc491652a871c9754c71c2eea57
  1. pkgs/