Add DeviceADPolicyManager to provide AD policy.

chrome/browser/chromeos/login/users/chrome_user_manager_impl.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/login/users/chrome_user_manager_impl.h"
 
 #include <stddef.h>
 
 #include <cstddef>
 #include <set>
@@ skipping 201 matching lines @@
                    weak_factory_.GetWeakPtr()));
   }
 
   local_accounts_subscription_ = cros_settings_->AddSettingsObserver(
       kAccountsPrefDeviceLocalAccounts,
       base::Bind(&ChromeUserManagerImpl::RetrieveTrustedDevicePolicies,
                  weak_factory_.GetWeakPtr()));
   multi_profile_user_controller_.reset(
       new MultiProfileUserController(this, GetLocalState()));
 
-  policy::BrowserPolicyConnectorChromeOS* connector =
-      g_browser_process->platform_part()->browser_policy_connector_chromeos();
-  avatar_policy_observer_.reset(new policy::CloudExternalDataPolicyObserver(
-      cros_settings_,
-      connector->GetDeviceLocalAccountPolicyService(),
-      policy::key::kUserAvatarImage,
-      this));
+  policy::DeviceLocalAccountPolicyService* device_local_account_policy_service =
+      g_browser_process->platform_part()
+          ->browser_policy_connector_chromeos()
+          ->GetDeviceLocalAccountPolicyService();
+  if (!device_local_account_policy_service) {
+    return;
+  }
+
+  avatar_policy_observer_ =
+      base::MakeUnique<policy::CloudExternalDataPolicyObserver>(
+          cros_settings_, device_local_account_policy_service,
+          policy::key::kUserAvatarImage, this);
   avatar_policy_observer_->Init();
-
-  wallpaper_policy_observer_.reset(new policy::CloudExternalDataPolicyObserver(
-      cros_settings_,
-      connector->GetDeviceLocalAccountPolicyService(),
-      policy::key::kWallpaperImage,
-      this));
+  wallpaper_policy_observer_ =
+      base::MakeUnique<policy::CloudExternalDataPolicyObserver>(
+          cros_settings_, device_local_account_policy_service,
+          policy::key::kWallpaperImage, this);
   wallpaper_policy_observer_->Init();
 }
 
 ChromeUserManagerImpl::~ChromeUserManagerImpl() {
 }
 
 void ChromeUserManagerImpl::Shutdown() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   ChromeUserManager::Shutdown();
 
@@ skipping 1088 matching lines @@
       break;
     default:
       NOTREACHED();
       break;
   }
 
   return user;
 }
 
 }  // namespace chromeos