Update from https://crrev.com/327068

build/android/pylib/utils/mock_calls.py

 # 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.
 
 """
 A test facility to assert call sequences while mocking their behavior.
 """
 
 import os
 import sys
@@ skipping 18 matching lines @@
 
       def do_check(call):
         def side_effect(*args, **kwargs):
           received_call = call(*args, **kwargs)
           self._test_case.assertTrue(
               self._expected_calls,
               msg=('Unexpected call: %s' % str(received_call)))
           expected_call, action = self._expected_calls.pop(0)
           self._test_case.assertTrue(
               received_call == expected_call,
-              msg=('Expected call missmatch:\n'
+              msg=('Expected call mismatch:\n'
                    '  expected: %s\n'
                    '  received: %s\n'
                    % (str(expected_call), str(received_call))))
           if callable(action):
             return action(*args, **kwargs)
           else:
             return action
         return side_effect
 
       self._test_case = test_case
@@ skipping 123 matching lines @@
     Raises:
       AssertionError if the watched targets do not receive the exact sequence
           of calls specified. Missing calls, extra calls, and calls with
           mismatching arguments, all cause the assertion to fail.
     """
     return self._AssertCalls(self, calls, self._watched)
 
   def assertCall(self, call, action=None):
     return self.assertCalls((call, action))