message: Make iterator work with C++11 style.
diff: @@ -30,8 +30,8 @@ constexpr char kUnknown[] = "<UNKNOWN>";
  void buildIndexTokenMap(
  const absl::node_hash_map<std::string, int>& token_index_map,
  absl::node_hash_map<int, absl::string_view>* index_token_map) {
  - for (const auto& [token, index] : token_index_map) {
  - (*index_token_map)[index] = token.data();
  + for (const auto& token : token_index_map) {
  + (*index_token_map)[token.second] = token.first;
  }
  }
  