module ActionView::Helpers::SanitizeHelper::ClassMethods

def safe_list_sanitizer

end
config.action_view.safe_list_sanitizer = MySpecialSanitizer.new
class Application < Rails::Application

Replace with any object that responds to +sanitize+.
Gets the Rails::HTML::SafeListSanitizer instance used by sanitize and +sanitize_css+. 
def safe_list_sanitizer
  @safe_list_sanitizer ||= sanitizer_vendor.safe_list_sanitizer.new
end