Disable supervised user creation when force sign in is enabled.

chrome/browser/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 3683 matching lines @@
       "supervised_user/legacy/supervised_user_sync_service_factory.h",
       "supervised_user/legacy/supervised_user_sync_service_observer.h",
     ]
   }
   if (enable_supervised_users && enable_themes) {
     sources += [
       "supervised_user/supervised_user_theme.cc",
       "supervised_user/supervised_user_theme.h",
     ]
   }
+  if (enable_supervised_users && !is_android && !is_chromeos) {
+    sources += [
+      "supervised_user/supervised_user_creation_policy_handler.cc",
+      "supervised_user/supervised_user_creation_policy_handler.h",
+    ]
+  }
   if (enable_webrtc) {
     sources += [
       "media/audio_debug_recordings_handler.h",
 
       # TODO(brettw) should webrtc_log_list.cc go here?
       "media/webrtc/audio_debug_recordings_handler.cc",
       "media/webrtc/webrtc_event_log_handler.cc",
       "media/webrtc/webrtc_event_log_handler.h",
       "media/webrtc/webrtc_log_uploader.cc",
       "media/webrtc/webrtc_log_uploader.h",
@@ skipping 716 matching lines @@
   # linking all of the test support.
   static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }