Check DeviceSettingsService is intialized before using.

chrome/browser/chromeos/policy/browser_policy_connector_chromeos.cc

 // 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.
 
 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 70 matching lines @@
 
 }  // namespace
 
 BrowserPolicyConnectorChromeOS::BrowserPolicyConnectorChromeOS()
     : weak_ptr_factory_(this) {
   if (g_testing_install_attributes) {
     install_attributes_.reset(g_testing_install_attributes);
     g_testing_install_attributes = nullptr;
   }
 
   // SystemSaltGetter or DBusThreadManager may be uninitialized on unit tests.

[xiyuan, 2017/05/17 19:56:36]

Update this document too.

[xiaoyinh(OOO Sep 11-29), 2017/05/17 20:12:27]

Done.

 
   // TODO(satorux): Remove SystemSaltGetter::IsInitialized() when it's ready
   // (removing it now breaks tests). crbug.com/141016.
   if (chromeos::SystemSaltGetter::IsInitialized() &&
-      chromeos::DBusThreadManager::IsInitialized()) {
+      chromeos::DBusThreadManager::IsInitialized() &&
+      chromeos::DeviceSettingsService::IsInitialized()) {
     // Don't initialize install attributes if g_testing_install_attributes have
     // been injected.
     if (!install_attributes_) {
       install_attributes_ = base::MakeUnique<chromeos::InstallAttributes>(
           chromeos::DBusThreadManager::Get()->GetCryptohomeClient());
       base::FilePath install_attrs_file;
       CHECK(PathService::Get(chromeos::FILE_INSTALL_ATTRIBUTES,
                              &install_attrs_file));
       install_attributes_->Init(install_attrs_file);
     }
@@ skipping 268 matching lines @@
         device_cloud_policy_manager_->device_store()->policy();
     if (policy_data) {
       affiliation_ids.insert(policy_data->device_affiliation_ids().begin(),
                              policy_data->device_affiliation_ids().end());
     }
   }
   return affiliation_ids;
 }
 
 }  // namespace policy