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Moves some of the validation logic into the appropriate objects, so we can more easily deal with Select, which takes its arguments in a Map, versus Plural/Gender which expect named arguments. R=efortuna@google.com Review URL: https://codereview.chromium.org//22286013 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@25965 260f80e4-7a28-3924-810f-c04153c831b5