Override SigninManager::SignOut if force-signin is enabled.

chrome/test/BUILD.gn

 # 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 4663 matching lines @@
     sources -= [
       "../browser/ui/bookmarks/bookmark_ui_utils_desktop_unittest.cc",
       "../browser/ui/sync/sync_promo_ui_unittest.cc",
     ]
   }
   if (!is_android && !is_chromeos) {
     sources += [
       "../browser/media/webrtc/native_desktop_media_list_unittest.cc",
       "../browser/metrics/desktop_session_duration/desktop_session_duration_tracker_unittest.cc",
       "../browser/signin/cross_device_promo_unittest.cc",
+      "../browser/signin/force_signin_manager_unittest.cc",
       "../browser/signin/signin_global_error_unittest.cc",
       "../browser/sync/sync_global_error_unittest.cc",
       "../browser/ui/webui/signin/signin_create_profile_handler_unittest.cc",
       "../browser/ui/webui/signin/sync_confirmation_handler_unittest.cc",
       "../browser/upgrade_detector_impl_unittest.cc",
     ]
   }
   if (enable_themes) {
     sources += [
       "../browser/themes/browser_theme_pack_unittest.cc",
@@ skipping 341 matching lines @@
       "touch_hud",
       "ui",
     ]
 
     if (is_linux && !is_android) {
       deps += [ "//components/font_service:manifest" ]
       packaged_services += [ "font_service" ]
     }
   }
 }