Ensure that we use the dtype keyword in normalize_chunks (#4646)
Ensure that we use the dtype keyword in normalize_chunks (#4646)

Fixes https://github.com/dask/dask/issues/4644
jakirkham/dask,jcrist/dask,ContinuumIO/dask,mrocklin/dask,jcrist/dask,blaze/dask,mrocklin/dask,dask/dask,ContinuumIO/dask,blaze/dask,jakirkham/dask,dask/dask