We should use UserID object to identify users instead of username.

chrome/browser/chromeos/policy/device_status_collector.cc

Index: chrome/browser/chromeos/policy/device_status_collector.cc
diff --git a/chrome/browser/chromeos/policy/device_status_collector.cc b/chrome/browser/chromeos/policy/device_status_collector.cc
index eefbf419193080795ac803f3e7783927239fdf4b..74f27eff71dd77eee007f1ced625befb2a91d637 100644
--- a/chrome/browser/chromeos/policy/device_status_collector.cc
+++ b/chrome/browser/chromeos/policy/device_status_collector.cc
@@ -149,7 +149,7 @@ GetCurrentKioskDeviceLocalAccount(chromeos::CrosSettings* settings) {
     return scoped_ptr<policy::DeviceLocalAccount>();
   const user_manager::User* const user =
       user_manager::UserManager::Get()->GetActiveUser();
-  const std::string user_id = user->GetUserID();
+  const user_manager::UserID user_id = user->GetUserID();
   const std::vector<policy::DeviceLocalAccount> accounts =
       policy::GetDeviceLocalAccounts(settings);
 
@@ -781,10 +781,10 @@ void DeviceStatusCollector::GetUsers(em::DeviceStatusReportRequest* request) {
       continue;
 
     em::DeviceUser* device_user = request->add_user();
-    const std::string& email = (*user)->email();
-    if (connector->GetUserAffiliation(email) == USER_AFFILIATION_MANAGED) {
+    const user_manager::UserID& user_id = (*user)->GetUserID();
+    if (connector->GetUserAffiliation(user_id) == USER_AFFILIATION_MANAGED) {
       device_user->set_type(em::DeviceUser::USER_TYPE_MANAGED);
-      device_user->set_email(email);
+      device_user->set_email(user_id.GetUserEmail());
     } else {
       device_user->set_type(em::DeviceUser::USER_TYPE_UNMANAGED);
       // Do not report the email address of unmanaged users.