Make git non-interactive when checking for src-internal access

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 108 matching lines @@
 
 def HaveSrcInternalAccess():
   """Checks whether access to src-internal is available."""
   with open(os.devnull, 'w') as nul:
     if subprocess.call(
         ['svn', 'ls', '--non-interactive',
          'svn://svn.chromium.org/chrome-internal/trunk/src-internal/'],
         shell=True, stdin=nul, stdout=nul, stderr=nul) == 0:
       return True
     return subprocess.call(
-        ['git', 'remote', 'show',
+        ['git', '-c', 'core.askpass=true', 'remote', 'show',
          'https://chrome-internal.googlesource.com/chrome/src-internal/'],
         shell=True, stdin=nul, stdout=nul, stderr=nul) == 0
 
 
 def DelayBeforeRemoving(target_dir):
   """A grace period before deleting the out of date toolchain directory."""
   if (os.path.isdir(target_dir) and
       not bool(int(os.environ.get('CHROME_HEADLESS', '0')))):
     for i in range(9, 0, -1):
       sys.stdout.write(
@@ skipping 56 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())