Actually, don't run presubmit checks on anything starting with
python and ending with _bin.

BUG=326975

Review URL: https://codereview.chromium.org/111643002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@240316 0039d316-1c4b-4281-b951-d872f2087c98