Cleanup mock device management backend

chrome/chrome_tests.gypi

 # Copyright (c) 2010 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.
 
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 1395 matching lines @@
         'browser/policy/file_based_policy_provider_unittest.cc',
         'browser/policy/device_management_backend_mock.h',
         'browser/policy/device_management_service_unittest.cc',
         'browser/policy/device_management_policy_cache_unittest.cc',
         'browser/policy/device_management_policy_provider_unittest.cc',
         'browser/policy/managed_prefs_banner_base_unittest.cc',
         'browser/policy/mock_configuration_policy_provider.cc',
         'browser/policy/mock_configuration_policy_provider.h',
         'browser/policy/mock_configuration_policy_store.cc',
         'browser/policy/mock_configuration_policy_store.h',
-        'browser/policy/mock_device_management_backend.cc',
         'browser/policy/mock_device_management_backend.h',
         'browser/preferences_mock_mac.cc',
         'browser/preferences_mock_mac.h',
         'browser/prefs/command_line_pref_store_unittest.cc',
         'browser/prefs/pref_change_registrar_unittest.cc',
         'browser/prefs/pref_member_unittest.cc',
         'browser/prefs/pref_notifier_unittest.cc',
         'browser/prefs/pref_service_unittest.cc',
         'browser/prefs/pref_set_observer_unittest.cc',
         'browser/prefs/pref_value_store_unittest.cc',
@@ skipping 1971 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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