void BookmarksAPI::OnListenerAdded(const EventListenerInfo& details) {
  bookmark_event_router_.reset(new BookmarkEventRouter(
      BookmarkModelFactory::GetForProfile(profile_)));
  ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.