Fix install-sysroot.py script not working behind proxy.

build/linux/sysroot_scripts/install-sysroot.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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.
 
 """Install Debian sysroots for building chromium.
 """
 
 # The sysroot is needed to ensure that binaries will run on Debian Wheezy,
 # the oldest supported linux distribution. For ARM64 linux, we have Debian
 # Jessie sysroot as Jessie is the first version with ARM64 support. This script
 # can be run manually but is more often run as part of gclient hooks. When run
 # from hooks this script is a no-op on non-linux platforms.
 
 # The sysroot image could be constructed from scratch based on the current
 # state or Debian Wheezy/Jessie but for consistency we currently use a
 # pre-built root image. The image will normally need to be rebuilt every time
 # chrome's build dependencies are changed.
 
 import hashlib
 import platform
 import optparse
 import os
 import re
 import shutil
 import subprocess
 import sys
-import urllib
+import urllib2
 
 SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
 sys.path.append(os.path.dirname(os.path.dirname(SCRIPT_DIR)))
 import detect_host_arch
 import gyp_chromium
 import gyp_environment
 
 
 URL_PREFIX = 'https://commondatastorage.googleapis.com'
 URL_PATH = 'chrome-linux-sysroot/toolchain'
@@ skipping 202 matching lines @@
       (target_platform, target_arch, sysroot)
   if os.path.isdir(sysroot):
     shutil.rmtree(sysroot)
   os.mkdir(sysroot)
   tarball = os.path.join(sysroot, tarball_filename)
   print 'Downloading %s' % url
   sys.stdout.flush()
   sys.stderr.flush()
   for _ in range(3):
     try:
-      urllib.urlretrieve(url, tarball)
+      response = urllib2.urlopen(url)
+      with open(tarball, "wb") as f:
+        f.write(response.read())
       break
     except:
       pass
   else:
     raise Error('Failed to download %s' % url)
   sha1sum = GetSha1(tarball)
   if sha1sum != tarball_sha1sum:
     raise Error('Tarball sha1sum is wrong.'
                 'Expected %s, actual: %s' % (tarball_sha1sum, sha1sum))
   subprocess.check_call(['tar', 'xf', tarball, '-C', sysroot])
   os.remove(tarball)
 
   with open(stamp, 'w') as s:
     s.write(url)
 
 
 if __name__ == '__main__':
   try:
     sys.exit(main(sys.argv[1:]))
   except Error as e:
     sys.stderr.write(str(e) + '\n')
     sys.exit(1)