I ran pychecker against the post-review and found a few other pieces that look to be refactoring errors. I've cleaned them up in this checkin. Specifically fixed issues with accessing a non-existant "filename" in the config parser and properly passing the variable to open a browser

before:
-------
Processing post-review...

Warnings...

post-review.py:4: Imported module (httplib) not used
post-review.py:6: Imported module (mimetypes) not used
post-review.py:122: (id) shadows builtin
post-review.py:143: Local variable (rsp) not used
post-review.py:159: Local variable (rsp) not used
post-review.py:334: No global (filename) found
post-review.py:386: Parameter (changenum) not used
post-review.py:423: Parameter (files) not used
post-review.py:835: Local variable (review_url) not used
post-review.py:838: Comparisons with True are not necessary and may not work as expected
post-review.py:843: No global (reviewUrl) found

after:
------
Processing post-review...

Warnings...

post-review.py:4: Imported module (httplib) not used
post-review.py:6: Imported module (mimetypes) not used
post-review.py:122: (id) shadows builtin
post-review.py:143: Local variable (rsp) not used
post-review.py:159: Local variable (rsp) not used
post-review.py:386: Parameter (changenum) not used
post-review.py:423: Parameter (files) not used
post-review.py:838: Comparisons with True are not necessary and may not work as expected