Add DeviceADPolicyManager to provide AD policy.

chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc

Index: chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc b/chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc
index b3bfde5f21bf78f3fa2c780e86239b174fc0ab6d..9bff11b18c16f718b2ba948bb60337b12c0a793e 100644
--- a/chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc
+++ b/chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc
@@ -32,6 +32,7 @@ DeviceCloudPolicyStoreChromeOS::DeviceCloudPolicyStoreChromeOS(
       enrollment_validation_done_(false),
       weak_factory_(this) {
   device_settings_service_->AddObserver(this);
+  device_settings_service_->SetDeviceMode(install_attributes_->GetMode());
 }
 
 DeviceCloudPolicyStoreChromeOS::~DeviceCloudPolicyStoreChromeOS() {
@@ -155,7 +156,8 @@ void DeviceCloudPolicyStoreChromeOS::UpdateFromService() {
     case chromeos::DeviceSettingsService::STORE_NO_POLICY:
     case chromeos::DeviceSettingsService::STORE_INVALID_POLICY:
     case chromeos::DeviceSettingsService::STORE_VALIDATION_ERROR: {
-      if (!enrollment_validation_done_) {
+      if (!enrollment_validation_done_ &&
+          install_attributes_->GetMode() != DEVICE_MODE_ENTERPRISE_AD) {
         enrollment_validation_done_ = true;
         const bool has_dm_token =
             status == chromeos::DeviceSettingsService::STORE_SUCCESS &&