Delete some stray lines

activerecord/lib/active_record/core.rb

@@ -71,8 +71,6 @@ module Core
       # The connection handler
       config_attribute :connection_handler
       self.connection_handler = ConnectionAdapters::ConnectionHandler.new
-
-      #
     end
 
     module ClassMethods

activerecord/lib/active_record/model.rb

 require 'active_support/deprecation'
-require 'active_support/concern'
 
 module ActiveRecord
   # <tt>ActiveRecord::Model</tt> can be included into a class to add Active Record persistence.