app/appengine: delete cron.sh

This script was used on two cron-part.yaml files
which are gone as of CL 46832 and CL 208397.

For golang/go#34744.

Change-Id: If8dd34391e57e011909d22142a4f6c979b8bb51f
Reviewed-on: https://go-review.googlesource.com/c/build/+/336389
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
diff --git a/app/appengine/cron.sh b/app/appengine/cron.sh
deleted file mode 100755
index 89a24f9..0000000
--- a/app/appengine/cron.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/bin/sh
-
-# Copyright 2016 The Go Authors.  All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
-
-# AppEngine has a single Cron configuration for all services and
-# versions in the project. To load the cron configuration, this script
-# concatenates the configuration from the two apps that use cron.
-
-set -x -e
-
-cd "$(dirname "$0")"
-
-[ -e cron.yaml ] && (echo "cron.yaml already exists!"; exit 1)
-(echo "cron:"; cat cron-part.yaml ../devapp/cron-part.yaml) > cron.yaml
-appcfg.py update_cron .
-rm cron.yaml