Update toolchain setup instructions to match reality.

win_toolchain/get_toolchain_if_necessary.py

 #!/usr/bin/env python
 # Copyright 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.
 
 """Downloads and unpacks a toolchain for building on Windows. The contents are
 matched by sha1 which will be updated when the toolchain is updated.
 
 Having a toolchain script in depot_tools means that it's not versioned
 directly with the source code. That is, if the toolchain is upgraded, but
@@ skipping 148 matching lines @@
   print 'You appear to be a Googler.'
   print
   print 'I\'m sorry for the hassle, but you need to do a one-time manual'
   print 'authentication. Please run:'
   print
   print '    download_from_google_storage --config'
   print
   print 'and follow the instructions.'
   print
   print 'NOTE 1: Use your google.com credentials, not chromium.org.'
-  print 'NOTE 2: Just press Enter when asked for a "project-id".'
+  print 'NOTE 2: Enter 0 when asked for a "project-id".'
   print
   print '-----------------------------------------------------------------'
   print
   sys.stdout.flush()
   sys.exit(1)
 
 
 def DelayBeforeRemoving(target_dir):
   """A grace period before deleting the out of date toolchain directory."""
   if (os.path.isdir(target_dir) and
@@ skipping 83 matching lines @@
 
   if options.output_json:
     shutil.copyfile(os.path.join(target_dir, '..', 'data.json'),
                     options.output_json)
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())