Add tray warning for Locally managed users.

chrome/browser/chromeos/login/user_manager_impl.cc

Index: chrome/browser/chromeos/login/user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/user_manager_impl.cc b/chrome/browser/chromeos/login/user_manager_impl.cc
index d2667d530157385aaebf3c16b3a0d6d3ff799f51..8609ed6f3336e3b47858a29249eb089819894e16 100644
--- a/chrome/browser/chromeos/login/user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/user_manager_impl.cc
@@ -379,6 +379,12 @@ std::string UserManagerImpl::GenerateUniqueLocallyManagedUserId() {
   return id;
 }
 
+std::string UserManagerImpl::GetManagerForManagedUser(
+    const std::string& managed_user_id) const {
+  // TODO (antrim): implement this method when we have appropriate API.
+  return std::string();
+}
+
 const User* UserManagerImpl::CreateLocallyManagedUserRecord(
       const std::string& e_mail,
       const string16& display_name) {