cleanup native_device.cc
cleanup native_device.cc

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