Chromad: Add authentication flow

components/user_manager/user_manager_base.cc

Index: components/user_manager/user_manager_base.cc
diff --git a/components/user_manager/user_manager_base.cc b/components/user_manager/user_manager_base.cc
index 24772d6b8e9d967ecf21e323303a84d6851baa8e..47843322658607fce6c8d1b229c2f5bc61751a63 100644
--- a/components/user_manager/user_manager_base.cc
+++ b/components/user_manager/user_manager_base.cc
@@ -696,7 +696,8 @@ void UserManagerBase::NotifyUserProfileImageUpdated(
 
 bool UserManagerBase::CanUserBeRemoved(const User* user) const {
   // Only regular and supervised users are allowed to be manually removed.
-  if (!user || !(user->HasGaiaAccount() || user->IsSupervised()))
+  if (!user ||
+      !(user->HasGaiaAccount() || user->IsSupervised() || user->IsAdUser()))
     return false;
 
   // Sanity check: we must not remove single user unless it's an enterprise
@@ -977,7 +978,8 @@ User* UserManagerBase::RemoveRegularOrSupervisedUserFromList(
       user = *it;
       it = users_.erase(it);
     } else {
-      if ((*it)->HasGaiaAccount() || (*it)->IsSupervised()) {
+      if ((*it)->HasGaiaAccount() || (*it)->IsSupervised() ||
+          (*it)->IsAdUser()) {
         const std::string user_email = (*it)->GetAccountId().GetUserEmail();
         prefs_users_update->AppendString(user_email);
       }