Disable warning W0404 in pylint.

BUG=none
TEST=should now work on googlers workstations

Review URL: http://codereview.chromium.org/6456010

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@74242 0039d316-1c4b-4281-b951-d872f2087c98