Closure compiler: Delete unused js_minify.py script.

This script was previously used with Grit, but that is no longer
the case since r682948.

Bug: None
Change-Id: I67446b17949c16493963d307f89e91ec43b06a89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2222765
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773377}

third_party/closure_compiler/js_minify.py

-#!/usr/bin/env python
-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-''' Javascript minifier using the closure compiler
-
-This minifier strips spaces and comments out of Javascript using the closure
-compiler. It takes the original Javascript on standard input, and outputs
-the minified output on standard output.
-
-Any errors or other messages from the compiler are output on standard error.
-'''
-
-import argparse
-import sys
-import tempfile
-
-from compiler import Compiler
-
-
-def Minify(source):
-  parser = argparse.ArgumentParser()
-  parser.add_argument("-c", "--closure_args", nargs=argparse.ZERO_OR_MORE,
-                      help="Arguments passed directly to the Closure compiler")
-  args = parser.parse_args()
-  with tempfile.NamedTemporaryFile(suffix='.js') as t1, \
-       tempfile.NamedTemporaryFile(suffix='.js') as t2:
-    t1.write(source)
-    t1.seek(0)
-    (compile_error, compile_stderr) = Compiler().run(
-        [t1.name],
-        out_file=t2.name,
-        closure_args=args.closure_args)
-    if compile_error:
-      print compile_stderr
-    t2.seek(0)
-    result = t2.read()
-    return result
-
-
-if __name__ == '__main__':
-  orig_stdout = sys.stdout
-  result = ''
-  try:
-    sys.stdout = sys.stderr
-    result = Minify(sys.stdin.read())
-  finally:
-    sys.stdout = orig_stdout
-    print result