message: Fix a missing field on cloning
  SessionConverter::Clone() should copy all the fields but request_type_ was missing.
diff: @@ -1200,6 +1200,7 @@ SessionConverter *SessionConverter::Clone() const {
  session_converter->config_ = config_;
  session_converter->use_cascading_window_ = use_cascading_window_;
  session_converter->selected_candidate_indices_ = selected_candidate_indices_;
  + session_converter->request_type_ = request_type_;
  if (session_converter->CheckState(SUGGESTION | PREDICTION | CONVERSION)) {
  // UpdateCandidateList() is not simple setter and it uses some members.
  