make cpplint happy
make cpplint happy

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