Method SetKeyValue

test/crash_logging_unittest.cc:35–38

 private:
  static void SetKeyValue(const butil::StringPiece& key,
                          const butil::StringPiece& value) {
    (*key_values_)[key.as_string()] = value.as_string();
  }

  static void ClearKeyValue(const butil::StringPiece& key) {
    key_values_->erase(key.as_string());