Use AccountIdKey to identify Active Directory accounts.

chromeos/dbus/auth_policy_client.cc

Index: chromeos/dbus/auth_policy_client.cc
diff --git a/chromeos/dbus/auth_policy_client.cc b/chromeos/dbus/auth_policy_client.cc
index cf2ed6b9faffdc08f427dee4e6d09550dde4d281..4a5b812fbac82c87c0acd52e93bb6ce0768b7903 100644
--- a/chromeos/dbus/auth_policy_client.cc
+++ b/chromeos/dbus/auth_policy_client.cc
@@ -61,10 +61,11 @@ class AuthPolicyClientImpl : public AuthPolicyClient {
 
   void RefreshUserPolicy(const AccountId& account_id,
                          const RefreshPolicyCallback& callback) override {
+    DCHECK(account_id.GetAccountType() == AccountType::ACTIVE_DIRECTORY);
     dbus::MethodCall method_call(authpolicy::kAuthPolicyInterface,
                                  authpolicy::kAuthPolicyRefreshUserPolicy);
     dbus::MessageWriter writer(&method_call);
-    writer.AppendString(account_id.GetObjGuid());
+    writer.AppendString(account_id.GetAccountIdKey());

[Thiemo Nagel, 2016/12/29 16:58:20]

I'm already changing this in https://codereview.chromium.org/2608573002/ which
probably will cause a conflict.

     proxy_->CallMethod(
         &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
         base::Bind(&AuthPolicyClientImpl::HandleRefreshPolicyCallback,