ASV Benchmarks Broken
Trying to run asv benchmarks is yielding

```bash
File "/Users/williamayd/Git/pandas/asv_bench/benchmarks/gil.py", line 3, in <module>
  from pandas import (DataFrame, Series, rolling_median, rolling_mean,
ImportError: cannot import name 'rolling_median'
```

3597de0ada3869c8841d05ef4353195a6e124184 removed pd.rolling_* functions but it looks like `asv_bench/benchmarks/gil.py` is still trying to import them, hence the error

cc @topper-123 