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 72 matching lines @@
         'browser/chromeos/login/mock_login_status_consumer.cc',
         'browser/chromeos/login/mock_login_status_consumer.h',
         'browser/chromeos/login/mock_login_utils.cc',
         'browser/chromeos/login/mock_login_utils.h',
         'browser/chromeos/login/mock_url_fetchers.cc',
         'browser/chromeos/login/mock_url_fetchers.h',
         'browser/chromeos/login/mock_user_image_manager.cc',
         'browser/chromeos/login/mock_user_image_manager.h',
         'browser/chromeos/login/mock_user_manager.cc',
         'browser/chromeos/login/mock_user_manager.h',
+        'browser/chromeos/net/mock_connectivity_state_helper.cc',
+        'browser/chromeos/net/mock_connectivity_state_helper.h',
         'browser/chromeos/policy/device_policy_builder.cc',
         'browser/chromeos/policy/device_policy_builder.h',
         'browser/chromeos/settings/device_settings_test_helper.cc',
         'browser/chromeos/settings/device_settings_test_helper.h',
         'browser/chromeos/settings/mock_owner_key_util.cc',
         'browser/chromeos/settings/mock_owner_key_util.h',
         'browser/chromeos/system/mock_statistics_provider.cc',
         'browser/chromeos/system/mock_statistics_provider.h',
         # The only thing used from browser is Browser::Type.
         'browser/download/download_test_file_activity_observer.cc',
@@ skipping 2305 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }