Avoid windows presubmit hang in gclient tests.

tests/git_common_test.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.
 
 """Unit tests for git_common.py"""
 
 import binascii
 import collections
 import os
@@ skipping 68 matching lines @@
     result = []
     with self.gc.ScopedPool(kind='threads') as pool:
       result = list(pool.imap(slow_square, xrange(10)))
     self.assertEqual([0, 1, 4, 9, 16, 25, 36, 49, 64, 81], result)
 
   def testThreadsCtrlC(self):
     result = []
     with self.assertRaises(KeyboardInterrupt):
       with self.gc.ScopedPool(kind='threads') as pool:
         # Make sure this pool is interrupted in mid-swing
-        for i in pool.imap(slow_square, xrange(1000000)):
+        for i in pool.imap(slow_square, xrange(20)):
           if i > 32:
             os.kill(os.getpid(), self.CTRL_C)
           result.append(i)
     self.assertEqual([0, 1, 4, 9, 16, 25], result)
 
   def testProcs(self):
     result = []
     with self.gc.ScopedPool() as pool:
       result = list(pool.imap(slow_square, xrange(10)))
     self.assertEqual([0, 1, 4, 9, 16, 25, 36, 49, 64, 81], result)
 
   def testProcsCtrlC(self):
     result = []
     with self.assertRaises(KeyboardInterrupt):
       with self.gc.ScopedPool() as pool:
         # Make sure this pool is interrupted in mid-swing
-        for i in pool.imap(slow_square, xrange(1000000)):
+        for i in pool.imap(slow_square, xrange(20)):
           if i > 32:
             os.kill(os.getpid(), self.CTRL_C)
           result.append(i)
     self.assertEqual([0, 1, 4, 9, 16, 25], result)
 
 
 class ProgressPrinterTest(GitCommonTestBase):
   class FakeStream(object):
     def __init__(self):
       self.data = set()
@@ skipping 155 matching lines @@
       name = 'file%d' % i
       tree[name] = ('100644', 'blob', self._intern_data(name))
     tree_hash = self.repo.run(self.gc.mktree, tree)
     self.assertEquals('37b61866d6e061c4ba478e7eb525be7b5752737d', tree_hash)
 
 
 if __name__ == '__main__':
   sys.exit(coverage_utils.covered_main(
     os.path.join(DEPOT_TOOLS_ROOT, 'git_common.py')
   ))