Revert "Rename mappedBy to map."
Revert "Rename mappedBy to map."

This reverts commit 17899.

Review URL: https://codereview.chromium.org//12087103

git-svn-id: d21bfdc9f98bb697a501ab295d9b4211dc860b14@17907 260f80e4-7a28-3924-810f-c04153c831b5

dart-lang/path