Remove content_taxonomy_allowed_values()

gistfile1.txt

module_load_include('inc', 'field', 'field.crud');

$fields = field_read_fields(array('type' => 'taxonomy_term_reference'));
foreach ($fields as $field) {
  if (isset($field['settings']['options_list_callback']) && $field['settings']['options_list_callback'] == 'content_taxonomy_allowed_values') {
    $field['settings']['options_list_callback'] = 'taxonomy_allowed_values';
    field_update_field($field);
  }
}