Revert "Bugfix: broadcast_arrays arg"
Revert "Bugfix: broadcast_arrays arg"

This reverts commit e1059f6896c170198980b4395a137e28a5f942f5.

hvy/chainer,okuta/chainer,keisuke-umezawa/chainer,wkentaro/chainer,hvy/chainer,rezoo/chainer,okuta/chainer,ktnyt/chainer,niboshi/chainer,jnishi/chainer,niboshi/chainer,keisuke-umezawa/chainer,ronekko/chainer,chainer/chainer,chainer/chainer,chainer/chainer,hvy/chainer,okuta/chainer,wkentaro/chainer,niboshi/chainer,pfnet/chainer,hvy/chainer,keisuke-umezawa/chainer,chainer/chainer,tkerola/chainer,jnishi/chainer,jnishi/chainer,niboshi/chainer,wkentaro/chainer,okuta/chainer,ktnyt/chainer,jnishi/chainer,ktnyt/chainer,wkentaro/chainer,ktnyt/chainer,keisuke-umezawa/chainer