Remove Skia's forked buildbot code

slave/skia_slave_scripts/check_compute_engine_disk_usage.sh

-#!/bin/bash
-#
-# Logs into the specified Skia compute engine instance, parses out the
-# persistent disk usage and compares it against the threshold.
-#
-# The SKIA_COMPUTE_ENGINE_HOSTNAME environment variable is the hostname of the
-# compute engine instance we want to check. The PERSISTENT_DISK_NAME is the
-# mounted path of the disk we want to check.
-#
-# Sample Usage:
-#  SKIA_COMPUTE_ENGINE_HOSTNAME=skia-master-a.c.skia-buildbots.google.com.internal \
-#  PERSISTENT_DISK_NAME=/home/default/skia-master \
-#  DELETE_TRYBOT_DIRS=True \
-#  bash check_compute_engine_disk_usage.sh
-#
-# Can also optionally specify the environment variable THRESHOLD (default 90).
-#
-
-THRESHOLD=${THRESHOLD:-90}
-
-# Check to see if the script can log into the compute engine instance.
-ssh -o UserKnownHostsFile=/dev/null -o CheckHostIP=no -o \
-StrictHostKeyChecking=no -p 22 $SKIA_COMPUTE_ENGINE_HOSTNAME 'df -h'
-ret_code=`echo $?`
-if [ "$ret_code" -ne 0 ]; then
-  echo -e "There was an error logging into the compute engine instance! Return code: $ret_code"
-  exit $ret_code
-fi
-
-function check_disk_space_usage {
-  complete_output=`ssh -o UserKnownHostsFile=/dev/null -o CheckHostIP=no -o \
-    StrictHostKeyChecking=no -p 22 $SKIA_COMPUTE_ENGINE_HOSTNAME 'df -h' | \
-    grep $PERSISTENT_DISK_NAME`; IFS=' ' v=($complete_output); \
-  percent_used=${v[4]/\%/}
-  echo $percent_used
-}
-
-# Log into the compute engine instance and parse the percentage used of the
-# persistent disk.
-percent_used=`check_disk_space_usage`
-if [ "$percent_used" -lt "$THRESHOLD" ]; then
-  echo -e "\nThe percentage used ($percent_used%) is below the threshold ($THRESHOLD%).\n"
-  exit 0
-else
-  echo -e "\nThe percentage used ($percent_used%) is at or beyond the threshold ($THRESHOLD%).\n"
-  if [[ ! -z "$DELETE_TRYBOT_DIRS" ]]; then
-    DELETE_CMD="rm -rf ~/skia-slave/buildbot/skiabot-linux-compile-vm-*/buildbot/third_party/chromium_buildbot/slave/*-Trybot; rm -rf
-~/skia-slave/buildbot/skiabot-linux-compile-vm-*/buildbot/third_party/chromium_buildbot/slave/*.log.*"
-    ssh -o UserKnownHostsFile=/dev/null -o CheckHostIP=no -o \
-      StrictHostKeyChecking=no -p 22 default@$SKIA_COMPUTE_ENGINE_HOSTNAME "$DELETE_CMD"
-    echo "Deleted the Trybot builder directories."
-    percent_used=`check_disk_space_usage`
-    echo "The percentage used is now: $percent_used%"
-  else
-    echo -e "Please make room on the compute engine instance by deleting unneeded files.\n"
-    exit 1
-  fi
-fi
-