diff --git a/hooks/install/check-upstart-scripts.sh b/hooks/install/check-upstart-scripts.sh
deleted file mode 100755
index 01e26a8..0000000
--- a/hooks/install/check-upstart-scripts.sh
+++ /dev/null
@@ -1,287 +0,0 @@
-#!/bin/bash
-# Copyright 2021 The Chromium OS Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# Various upstart init script checks.
-
-DOC_RESOURCE_URL="https://dev.chromium.org/chromium-os/chromiumos-design-docs/boot-design#TOC-Runtime-Resource-Limits"
-
-# Default portage vars to make shellcheck happy.
-: "${CATEGORY:=}"
-: "${D:=}"
-: "${PN:=}"
-
-# Allow existing packages w/out oom to pass for now.
-# NB: DO NOT ADD ANY NEW ENTRIES HERE.
-known_bad_oom() {
-  case "${CATEGORY}/${PN}" in
-  app-accessibility/brltty|\
-  app-accessibility/googletts|\
-  app-benchmarks/bootchart|\
-  app-crypt/trousers|\
-  chromeos-base/actions|\
-  chromeos-base/ap-daemons|\
-  chromeos-base/ap-infra|\
-  chromeos-base/ap-net|\
-  chromeos-base/ap-scm|\
-  chromeos-base/ap-security|\
-  chromeos-base/ap-wireless|\
-  chromeos-base/arc-adbd|\
-  chromeos-base/arc-apk-cache|\
-  chromeos-base/arc-appfuse|\
-  chromeos-base/arc-base|\
-  chromeos-base/arc-common-scripts|\
-  chromeos-base/arc-myfiles|\
-  chromeos-base/arc-networkd|\
-  chromeos-base/arc-obb-mounter|\
-  chromeos-base/arc-oemcrypto|\
-  chromeos-base/arc-removable-media|\
-  chromeos-base/arc-sdcard|\
-  chromeos-base/arc-setup|\
-  chromeos-base/arc-sslh-init|\
-  chromeos-base/arcvm-common-scripts|\
-  chromeos-base/arcvm-forward-pstore|\
-  chromeos-base/arcvm-launch|\
-  chromeos-base/arcvm-mojo-proxy|\
-  chromeos-base/arcvm-vsock-proxy|\
-  chromeos-base/atrusctl|\
-  chromeos-base/attestation|\
-  chromeos-base/authpolicy|\
-  chromeos-base/biod|\
-  chromeos-base/bluetooth|\
-  chromeos-base/bootcomplete-embedded|\
-  chromeos-base/bootcomplete-login|\
-  chromeos-base/buffet|\
-  chromeos-base/cdm-oemcrypto|\
-  chromeos-base/chaps|\
-  chromeos-base/chromeos-accelerometer-init|\
-  chromeos-base/chromeos-activate-date|\
-  chromeos-base/chromeos-activate-date-ultima|\
-  chromeos-base/chromeos-adb-env|\
-  chromeos-base/chromeos-auth-config|\
-  chromeos-base/chromeos-bsp-atlas|\
-  chromeos-base/chromeos-bsp-baseboard-asurada|\
-  chromeos-base/chromeos-bsp-baseboard-cherry|\
-  chromeos-base/chromeos-bsp-baseboard-gru|\
-  chromeos-base/chromeos-bsp-baseboard-herobrine|\
-  chromeos-base/chromeos-bsp-baseboard-kukui|\
-  chromeos-base/chromeos-bsp-baseboard-oak|\
-  chromeos-base/chromeos-bsp-baseboard-trogdor|\
-  chromeos-base/chromeos-bsp-beaglebone_servo|\
-  chromeos-base/chromeos-bsp-caroline-private|\
-  chromeos-base/chromeos-bsp-endeavour-private|\
-  chromeos-base/chromeos-bsp-gale|\
-  chromeos-base/chromeos-bsp-hatch-private|\
-  chromeos-base/chromeos-bsp-mistral|\
-  chromeos-base/chromeos-bsp-mobbase|\
-  chromeos-base/chromeos-bsp-nocturne|\
-  chromeos-base/chromeos-bsp-veyron|\
-  chromeos-base/chromeos-bsp-veyron-private|\
-  chromeos-base/chromeos-bsp-wilco|\
-  chromeos-base/chromeos-bsp-zork-private|\
-  chromeos-base/chromeos-chrome|\
-  chromeos-base/chromeos-config-tools|\
-  chromeos-base/chromeos-cr50-scripts|\
-  chromeos-base/chromeos-ec-driver-init|\
-  chromeos-base/chromeos-firewall-init|\
-  chromeos-base/chromeos-firewall-init-mobbase|\
-  chromeos-base/chromeos-imageburner|\
-  chromeos-base/chromeos-init|\
-  chromeos-base/chromeos-installer|\
-  chromeos-base/chromeos-login|\
-  chromeos-base/chromeos-machine-id-regen|\
-  chromeos-base/chromeos-nat-init|\
-  chromeos-base/chromeos-termina-scripts|\
-  chromeos-base/chromeos-test-init|\
-  chromeos-base/chromeos-trim|\
-  chromeos-base/chunnel|\
-  chromeos-base/crash-reporter|\
-  chromeos-base/cros-camera|\
-  chromeos-base/cros-camera-libs|\
-  chromeos-base/cros-disks|\
-  chromeos-base/crosdns|\
-  chromeos-base/croslog|\
-  chromeos-base/cryptohome|\
-  chromeos-base/debugd|\
-  chromeos-base/diagnostics|\
-  chromeos-base/disk_updater|\
-  chromeos-base/dlcservice|\
-  chromeos-base/easy-unlock|\
-  chromeos-base/factory_installer|\
-  chromeos-base/fastrpc|\
-  chromeos-base/feedback|\
-  chromeos-base/gdisp|\
-  chromeos-base/goldfishd|\
-  chromeos-base/hammerd|\
-  chromeos-base/hermes|\
-  chromeos-base/iioservice|\
-  chromeos-base/imageloader|\
-  chromeos-base/infineon-firmware-updater|\
-  chromeos-base/ip-peripheral|\
-  chromeos-base/ippusb_bridge|\
-  chromeos-base/ippusb_manager|\
-  chromeos-base/kerberos|\
-  chromeos-base/lorgnette|\
-  chromeos-base/metrics|\
-  chromeos-base/midis|\
-  chromeos-base/ml|\
-  chromeos-base/modemfwd|\
-  chromeos-base/modemfwd-helpers-coral|\
-  chromeos-base/modemfwd-helpers-dedede|\
-  chromeos-base/modemfwd-helpers-drallion|\
-  chromeos-base/modemfwd-helpers-hatch|\
-  chromeos-base/modemfwd-helpers-nautilus|\
-  chromeos-base/modemfwd-helpers-octopus|\
-  chromeos-base/modemfwd-helpers-sarien|\
-  chromeos-base/modemfwd-helpers-zork|\
-  chromeos-base/mri_package|\
-  chromeos-base/mtpd|\
-  chromeos-base/nodejs-scripts|\
-  chromeos-base/oobe_config|\
-  chromeos-base/os_install_service|\
-  chromeos-base/p2p|\
-  chromeos-base/patchpanel|\
-  chromeos-base/pdfc-scripts|\
-  chromeos-base/permission_broker|\
-  chromeos-base/power_manager|\
-  chromeos-base/quickoffice|\
-  chromeos-base/rialto-cellular-autoconnect|\
-  chromeos-base/rialto-modem-watchdog|\
-  chromeos-base/runtime_probe|\
-  chromeos-base/shill|\
-  chromeos-base/sirenia|\
-  chromeos-base/smbprovider|\
-  chromeos-base/swap-init|\
-  chromeos-base/thermald|\
-  chromeos-base/timberslide|\
-  chromeos-base/tpm_manager|\
-  chromeos-base/trunks|\
-  chromeos-base/tty|\
-  chromeos-base/u2fd|\
-  chromeos-base/update_engine|\
-  chromeos-base/usb_bouncer|\
-  chromeos-base/userfeedback|\
-  chromeos-base/viking-hid|\
-  chromeos-base/virtual-file-provider|\
-  chromeos-base/vm_host_tools|\
-  chromeos-base/vpd|\
-  chromeos-base/weaveauth|\
-  chromeos-base/webserver|\
-  chromeos-base/whining|\
-  dev-util/hdctools|\
-  media-libs/arc-camera-service|\
-  media-libs/cros-camera-libcab|\
-  media-libs/dlm|\
-  media-libs/img-ddk|\
-  media-sound/adhd|\
-  net-dns/avahi-daemon|\
-  net-firewall/conntrack-tools|\
-  net-libs/libqrtr|\
-  net-misc/modemmanager-next|\
-  net-misc/nldaemon|\
-  net-misc/rmtfs|\
-  net-misc/tlsdate|\
-  net-print/cups|\
-  net-print/cups_proxy|\
-  net-wireless/bluez|\
-  net-wireless/floss|\
-  net-wireless/iwlwifi_rescan|\
-  net-wireless/ot-br-posix|\
-  net-wireless/wpa_supplicant|\
-  net-wireless/wpa_supplicant-2_8|\
-  net-wireless/wpa_supplicant-2_9|\
-  sys-apps/apex-monitor|\
-  sys-apps/cecservice|\
-  sys-apps/huddly-falcon-updater|\
-  sys-apps/huddly-monitor|\
-  sys-apps/fwupd|\
-  sys-apps/mimo-houston-mcu-updater|\
-  sys-apps/mimo-monitor|\
-  sys-apps/moblab|\
-  sys-apps/satlab|\
-  sys-apps/upstart|\
-  sys-apps/ureadahead|\
-  sys-apps/usbguard|\
-  sys-power/dptf|\
-  sys-process/audit|\
-  virtual/chromeos-firewall|\
-  virtual/target-jetstream-test-root)
-    return 0
-    ;;
-  chromeos-base/arc-keymaster)  # We don't control the package name.  nocheck
-    return 0
-    ;;
-  esac
-
-  return 1
-}
-
-# Require an oom score line.
-check_oom() {
-  local config="$1"
-  local relconfig="${config#${D}}"
-
-  if ! grep -q '^oom score ' "${config}"; then
-    local msg="${relconfig}: missing 'oom score' line."
-    msg+=" Please see:\n  ${DOC_RESOURCE_URL}"
-    if known_bad_oom; then
-      eqawarn "${msg}"
-    else
-      eerror "${msg}"
-      return 1
-    fi
-  else
-    if grep -q '^oom score *-1000' "${config}"; then
-      eerror "${relconfig}: Use 'oom score never' instead."
-      return 1
-    fi
-  fi
-
-  return 0
-}
-
-# Main entry point for this hook.
-check() {
-  local arg ret_oom=0
-
-  for arg in "$@"; do
-    if [[ -L "${arg}" ]]; then
-      continue
-    fi
-
-    check_oom "${arg}"
-    : $(( ret_oom += $? ))
-  done
-
-  if [[ ${ret_oom} -eq 0 ]] && known_bad_oom; then
-    eqawarn "Please remove ${CATEGORY}/${PN} from known_bad_oom in $0."
-  fi
-
-  local ret=$(( ret_oom ))
-  if [[ ${ret} -ne 0 ]]; then
-    die "Init scripts have errors."
-  fi
-}
-
-usage() {
-  cat <<EOF
-Usage: $0 <upstart init files>
-EOF
-  exit 1
-}
-
-main() {
-  shopt -s nullglob
-
-  if [[ -n ${D} ]]; then
-    # Inside ebuild env.
-    check "${D}"/etc/init/*.conf "${D}"/usr/local/etc/init/*.conf
-  else
-    if [[ $# -eq 0 ]]; then
-      usage
-    fi
-    check "$@"
-  fi
-}
-main "$@"