Using PolicyServiceWatcher instead of PolicyWatcherLinux/Win/Mac.

components/policy/core/common/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/features.gni")
 
 source_set("common") {
   defines = [ "POLICY_COMPONENT_IMPLEMENTATION" ]
 
   if (enable_configuration_policy) {
@@ skipping 63 matching lines @@
       "external_data_manager.h",
       "mac_util.cc",
       "mac_util.h",
       "policy_bundle.cc",
       "policy_bundle.h",
       "policy_details.h",
       "policy_load_status.cc",
       "policy_load_status.h",
       "policy_loader_ios.h",
       "policy_loader_ios.mm",
-      "policy_loader_mac.cc",
       "policy_loader_mac.h",
+      "policy_loader_mac.mm",
       "policy_loader_win.cc",
       "policy_loader_win.h",
       "policy_map.cc",
       "policy_map.h",
       "policy_namespace.cc",
       "policy_namespace.h",
       "policy_pref_names.cc",
       "policy_pref_names.h",
       "policy_provider_android.cc",
       "policy_provider_android.h",
@@ skipping 94 matching lines @@
       "policy_service.cc",
       "policy_service.h",
       "policy_service_stub.cc",
       "policy_service_stub.h",
     ]
     deps = [
       "//base",
     ]
   }
 }