Change public methods to protected
Change public methods to protected

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