run through cygwin python anymore (and fails subtlety).

BUG=None
TEST=None
RS=pkasting

Review URL: http://codereview.chromium.org/6400002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@72718 0039d316-1c4b-4281-b951-d872f2087c98