One polymer_config.js to rule them all.

R=michaelpg@chromium.org,fukino@chromium.org,mfoltz@chromium.org
BUG=425626

Review URL: https://codereview.chromium.org/1224783005

Cr-Commit-Position: refs/heads/master@{#337882}
    OobeUI::GetSupervisedUserCreationScreenActor() {
  return supervised_user_creation_screen_actor_;
}

    OobeUI::GetSupervisedUserCreationScreenActor() {
  return supervised_user_creation_screen_actor_;
}
