revert commented-out

Author: jbrockmendel

pandas/tests/indexes/test_base.py

@@ -136,7 +136,7 @@ def test_constructor_from_series_freq(self):
         # GH 6273
         # create from a series, passing a freq
         dts = ["1-1-1990", "2-1-1990", "3-1-1990", "4-1-1990", "5-1-1990"]
-        expected = DatetimeIndex(dts, freq="MS")  # .as_unit("ns")
+        expected = DatetimeIndex(dts, freq="MS")
 
         s = Series(pd.to_datetime(dts))
         result = DatetimeIndex(s, freq="MS")