Remove babel from third_party

Change-Id: I2b7aaff12477552ab9490deeeb31e2179897968b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/420281
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Commit-Queue: Mayank Patke <fishythefish@google.com>

third_party/babel/update.sh

@@ -1,29 +0,0 @@
-#!/usr/bin/env bash
-# Uploads a new version of d8 CIPD package
-set -e
-set -x
-
-if [ -z "$1" ]; then
-  echo "Usage: update.sh version"
-  exit 1
-fi
-
-version=$1
-
-tmpdir=$(mktemp -d)
-cleanup() {
-  rm -rf "$tmpdir"
-}
-trap cleanup EXIT HUP INT QUIT TERM PIPE
-cd "$tmpdir"
-
-for file in "babel.js" "babel.min.js" "LICENSE"
-do
-  curl -o $file "https://unpkg.com/@babel/standalone@$version/$file"
-done
-
-cipd create \
-  -name dart/third_party/babel \
-  -in . \
-  -install-mode copy \
-  -tag version:$version