Revert of Delete dead signin code (SigninGlobalError)

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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 204 matching lines @@
       'browser/service_process/service_process_control_mac_unittest.mm',
       'browser/services/gcm/fake_gcm_profile_service.cc',
       'browser/services/gcm/fake_gcm_profile_service.h',
       'browser/services/gcm/fake_signin_manager.cc',
       'browser/services/gcm/fake_signin_manager.h',
       'browser/services/gcm/gcm_account_tracker_unittest.cc',
       'browser/shell_integration_win_unittest.cc',
       'browser/signin/account_reconcilor_unittest.cc',
       'browser/signin/chrome_signin_client_unittest.cc',
       'browser/signin/local_auth_unittest.cc',
+      'browser/signin/signin_global_error_unittest.cc',
       'browser/signin/signin_manager_unittest.cc',
       'browser/signin/signin_tracker_unittest.cc',
       'browser/signin/test_signin_client_builder.cc',
       'browser/ssl/certificate_error_report_unittest.cc',
       'browser/ssl/ssl_error_classification_unittest.cc',
       'browser/ssl/ssl_error_handler_unittest.cc',
       'browser/status_icons/status_icon_menu_model_unittest.cc',
       'browser/status_icons/status_icon_unittest.cc',
       'browser/status_icons/status_tray_unittest.cc',
       'browser/sync/about_sync_util_unittest.cc',
@@ skipping 2214 matching lines @@
             '<@(chrome_unit_tests_chromeos_sources)',
             '<@(chrome_unit_tests_chromeos_gtestjs_sources)',
             '<@(chrome_unit_tests_chromeos_js_sources)',
           ],
           'dependencies': [
             '../ash/ash_resources.gyp:ash_resources',
             '../components/components.gyp:drive_test_support',
             '../ui/chromeos/ui_chromeos.gyp:ui_chromeos_resources',
           ],
           'sources!': [
+            'browser/signin/signin_global_error_unittest.cc',
             'browser/signin/signin_manager_unittest.cc',
             'browser/signin/signin_names_io_thread_unittest.cc',
           ],
         }],
         ['use_x11==1', {
           'dependencies': [
             '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
             '../ui/events/devices/events_devices.gyp:events_devices',
           ],
         }],
@@ skipping 422 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }