rails/rails — pull request #11057 by yangchenyun (2013-06-22 16:18:31+00:00)
Title: fix dependencies on AS:Concern in ActiveModel::Name

ActiveSupport::Concern is used at [L24]( https://github.com/rails/rails/tree/master/activemodel/lib/active_model/conversion.rb#L24) but isnt' required explicitly.