function populate_roles_300() {
  $role = get_role( 'administrator' );

  if ( ! empty( $role ) ) {
    $role->add_cap( 'update_core' );
    $role->add_cap( 'list_users' );
    $role->add_cap( 'remove_users' );
    $role->add_cap( 'promote_users' );
    $role->add_cap( 'edit_theme_options' );
    $role->add_cap( 'delete_themes' );
    $role->add_cap( 'export' );
  }
}