Roll virtualenv 12.0->15.0.2

bootstrap/bootstrap.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 import argparse
 import contextlib
 import glob
 import logging
 import os
@@ skipping 133 matching lines @@
   pip = os.path.join(sys.prefix, bin_dir, 'pip')
 
   links = get_links(deps)
   with html_index(links) as ipath:
     requirements = []
     # TODO(iannucci): Do this as a requirements.txt
     for name, deps_entry in deps.iteritems():
       if not deps_entry.get('implicit'):
         requirements.append('%s==%s' % (name, deps_entry['version']))
     subprocess.check_call(
-        [pip, 'install', '--no-index', '--download-cache',
-         os.path.join(ROOT, '.wheelcache'), '-f', ipath] + requirements)
+        [pip, 'install', '--no-index', '-f', ipath] + requirements)
 
 
 def activate_env(env, deps, quiet=False):
   if hasattr(sys, 'real_prefix'):
     LOGGER.error('Already activated environment!')
     return
 
   if not quiet:
     print 'Activating environment: %r' % env
   assert isinstance(deps, dict)
@@ skipping 84 matching lines @@
   opts = parser.parse_args(args)
 
   deps = merge_deps(opts.deps_file)
   activate_env(opts.env_path, deps, opts.quiet)
 
 
 if __name__ == '__main__':
   logging.basicConfig()
   LOGGER.setLevel(logging.DEBUG)
   sys.exit(main(sys.argv[1:]))