Revert unnecessary change in BatchNorm test
Revert unnecessary change in BatchNorm test

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