Remove use of `DefinesClass` in Load.scala
Remove use of `DefinesClass` in Load.scala

It turns out that `DefinesClass` was a dead data: it was passed around
but not used anywhere.

sbt/sbt,Duhemm/sbt,xuwei-k/xsbt,sbt/sbt,sbt/sbt,xuwei-k/xsbt,mdedetrich/sbt,sbt/sbt,xuwei-k/xsbt,mdedetrich/sbt,xuwei-k/xsbt,xuwei-k/xsbt,sbt/sbt,mdedetrich/sbt,sbt/sbt,mdedetrich/sbt,mdedetrich/sbt,mdedetrich/sbt,mdedetrich/sbt,sbt/sbt,Duhemm/sbt