r293250 broke it. I didn't realize that check_bucket_permissions
was shared code. It now only returns a single value.

TBR=vadimsh@chromium.org

Review URL: https://codereview.chromium.org/782643002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@293256 0039d316-1c4b-4281-b951-d872f2087c98