Add DeviceADPolicyManager to provide AD policy.

chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
index dc203f3906e8ddb75d85f9cd269669b6a1358ea3..cdad94d4295283df4356f2560323a277026b1eec 100644
--- a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
@@ -452,10 +452,14 @@ void CoreOobeHandler::UpdateLabel(const std::string& id,
 }
 
 void CoreOobeHandler::UpdateDeviceRequisition() {
-  policy::BrowserPolicyConnectorChromeOS* connector =
-      g_browser_process->platform_part()->browser_policy_connector_chromeos();
-  CallJSOrDefer("updateDeviceRequisition",
-         connector->GetDeviceCloudPolicyManager()->GetDeviceRequisition());
+  policy::DeviceCloudPolicyManagerChromeOS* policy_manager =
+      g_browser_process->platform_part()
+          ->browser_policy_connector_chromeos()
+          ->GetDeviceCloudPolicyManager();
+  if (policy_manager) {
+    CallJSOrDefer("updateDeviceRequisition",
+                  policy_manager->GetDeviceRequisition());
+  }
 }
 
 void CoreOobeHandler::UpdateKeyboardState() {