void LoginPromptBrowserTestObserver::RemoveHandler(LoginHandler* handler) {
  std::list<LoginHandler*>::iterator i = std::find(handlers_.begin(),
                                                   handlers_.end(),
                                                   handler);
  EXPECT_TRUE(i != handlers_.end());
  if (i != handlers_.end())
    handlers_.erase(i);
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.