Remove redundant pooling modules
Remove redundant pooling modules

wkentaro/chainer,t-abe/chainer,cupy/cupy,chainer/chainer,hvy/chainer,hvy/chainer,keisuke-umezawa/chainer,AlpacaDB/chainer,niboshi/chainer,okuta/chainer,cupy/cupy,ktnyt/chainer,ytoyama/yans_chainer_hackathon,okuta/chainer,niboshi/chainer,anaruse/chainer,niboshi/chainer,kiyukuta/chainer,jnishi/chainer,kashif/chainer,Kaisuke5/chainer,benob/chainer,okuta/chainer,keisuke-umezawa/chainer,wkentaro/chainer,jnishi/chainer,niboshi/chainer,ktnyt/chainer,ktnyt/chainer,truongdq/chainer,muupan/chainer,laysakura/chainer,kikusu/chainer,sinhrks/chainer,wkentaro/chainer,jnishi/chainer,wkentaro/chainer,chainer/chainer,ysekky/chainer,cemoody/chainer,keisuke-umezawa/chainer,aonotas/chainer,tscohen/chainer,chainer/chainer,tkerola/chainer,okuta/chainer,rezoo/chainer,delta2323/chainer,sou81821/chainer,t-abe/chainer,minhpqn/chainer,hvy/chainer,jnishi/chainer,cupy/cupy,tigerneil/chainer,muupan/chainer,cupy/cupy,ronekko/chainer,sinhrks/chainer,AlpacaDB/chainer,hvy/chainer,benob/chainer,kikusu/chainer,keisuke-umezawa/chainer,ktnyt/chainer,truongdq/chainer,1986ks/chainer,pfnet/chainer,chainer/chainer