Add a unified observer to replace NetworkManagerObserver

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 586 matching lines @@
         'browser/chromeos/login/hwid_checker_unittest.cc',
         'browser/chromeos/login/merge_session_load_page_unittest.cc',
         'browser/chromeos/login/mock_auth_attempt_state_resolver.cc',
         'browser/chromeos/login/mock_auth_attempt_state_resolver.h',
         'browser/chromeos/login/online_attempt_unittest.cc',
         'browser/chromeos/login/parallel_authenticator_unittest.cc',
         'browser/chromeos/login/user_manager_unittest.cc',
         'browser/chromeos/memory/oom_priority_manager_unittest.cc',
         'browser/chromeos/mobile/mobile_activator_unittest.cc',
         'browser/chromeos/mobile_config_unittest.cc',
+        'browser/chromeos/net/mock_connectivity_state_helper.cc',
+        'browser/chromeos/net/mock_connectivity_state_helper.h',
         'browser/chromeos/net/network_portal_detector_unittest.cc',
         'browser/chromeos/net/onc_utils_unittest.cc',
         'browser/chromeos/offline/offline_load_page_unittest.cc',
         'browser/chromeos/power/session_length_limiter_unittest.cc',
         'browser/chromeos/preferences_unittest.cc',
         'browser/chromeos/process_proxy/process_output_watcher_unittest.cc',
         'browser/chromeos/proxy_config_service_impl_unittest.cc',
         'browser/chromeos/settings/cros_settings_unittest.cc',
         'browser/chromeos/settings/device_settings_provider_unittest.cc',
         'browser/chromeos/settings/device_settings_service_unittest.cc',
@@ skipping 1793 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }