It's member are generated and confuse pylint.

TBR=cmp@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/10169032

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@133719 0039d316-1c4b-4281-b951-d872f2087c98