fix test_broadcast_to to use numpy_xchaiener_array_equal
fix test_broadcast_to to use numpy_xchaiener_array_equal

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