BUG: Fix argument order in call to super
- [x] tests added / passed
- [x] passes `git diff upstream/master | flake8 --diff`

`super` should have arguments (type, object), not (object, type).

I've run `test_fast.sh` using Python 2.7 and it gives [2 failures](https://github.com/pydata/pandas/files/225866/testfail.txt) relating to language locales (I'm using en_GB). Pretty sure these are unrelated to the commit.

hah I guess we don't have a test for that

can u create a test that hits that path as well
 Sure. I could find a concrete sub-class of `PandasObject` that doesn't implement `memory_usage`, instantiate that, get its `sizeof()` and check it returns something of the correct type? For example, from a quick look, looks like the `GroupBy` class is such a class.
 can you rebase / update
 ## [Current coverage](https://codecov.io/gh/pydata/pandas/pull/12924?src=pr) is **83.76%**

> Merging [#12924](https://codecov.io/gh/pydata/pandas/pull/12924?src=pr) into [master](https://codecov.io/gh/pydata/pandas/branch/master?src=pr) will decrease coverage by **0.38%**

``` diff
@@             master   #12924   diff @@
========================================
  Files           138      135     -3   
  Lines         50392    49640   -752   
  Methods           0        0          
  Branches          0        0          
========================================
- Hits          42406    41583   -823   
- Misses         7986     8057    +71   
  Partials          0        0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last updated by [4b50149...68e4b90](https://codecov.io/gh/pydata/pandas/compare/4b501497a88c118c2bfdcdbc4a5b216b68b1b88c...68e4b9096c4b9fd4098a397335a694add5316ff5)
 @jreback Added a test to hit the path.
 thanks! nice way of testing this!
