Fix a typo that resulted in no tests to be run in depot_tools. :(

tests/trychange_unittest.py

 #!/usr/bin/env python
 # Copyright (c) 2011 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 trychange.py."""
 
 # pylint: disable=E1103,W0403
 
 # Fixes include path.
 from super_mox import SuperMoxTestBase
 
+import subprocess2
 import trychange
 
 
 class TryChangeTestsBase(SuperMoxTestBase):
   """Setups and tear downs the mocks but doesn't test anything as-is."""
   def setUp(self):
     SuperMoxTestBase.setUp(self)
-    self.mox.StubOutWithMock(trychange.gclient_utils, 'CheckCall')
+    self.mox.StubOutWithMock(subprocess2, 'communicate')
     self.mox.StubOutWithMock(trychange.scm.GIT, 'Capture')
     self.mox.StubOutWithMock(trychange.scm.GIT, 'GenerateDiff')
     self.mox.StubOutWithMock(trychange.scm.GIT, 'GetCheckoutRoot')
     self.mox.StubOutWithMock(trychange.scm.GIT, 'GetEmail')
     self.mox.StubOutWithMock(trychange.scm.GIT, 'GetPatchName')
     self.mox.StubOutWithMock(trychange.scm.GIT, 'GetUpstreamBranch')
     self.mox.StubOutWithMock(trychange.scm.SVN, 'DiffItem')
     self.mox.StubOutWithMock(trychange.scm.SVN, 'GenerateDiff')
     self.mox.StubOutWithMock(trychange.scm.SVN, 'GetCheckoutRoot')
     self.mox.StubOutWithMock(trychange.scm.SVN, 'GetEmail')
@@ skipping 69 matching lines @@
     self.mox.ReplayAll()
     git = trychange.GIT(self.options, self.fake_root)
     self.assertEqual(git.GetFileNames(), self.expected_files)
     self.assertEqual(git.checkout_root, self.fake_root)
     self.assertEqual(git.GenerateDiff(), 'A diff')
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()