check_bucket_permissions() takes exactly 2 arguments (3 given)

TBR=vadimsh@chromium.org

Review URL: https://codereview.chromium.org/780113003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@293254 0039d316-1c4b-4281-b951-d872f2087c98