void InputMethodBase::SetFocusedTextInputClient(TextInputClient* client) {
  TextInputClient* old = text_input_client_;
  OnWillChangeFocusedClient(old, client);
  text_input_client_ = client;  // NULL allowed.
  OnDidChangeFocusedClient(old, client);
}

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.