instance method storage_strategy

# File actionpack/lib/action_controller/metal/request_forgery_protection.rb, line 236
        def storage_strategy(name)
          case name
          when :session
            SessionStore.new
          when :cookie
            CookieStore.new(:csrf_token)
          else
            return name if is_storage_strategy?(name)
            raise ArgumentError, "Invalid CSRF token storage strategy, use :session, :cookie, or a custom CSRF token storage class."
          end
        end