Merge "Clean up the attribute searching func" into main

}

Result<Res_value> XmlParser::Node::GetAttributeValue(const std::string& name) const {

  String16 name16;

  return FindAttribute(parser_, name, [&](size_t index) -> bool {

    size_t len;

    const String16 key16(parser_.getAttributeName(index, &len));

    std::string key = String8(key16).c_str();

    return key == name;

    if (name16.empty()) {

        name16 = String16(name.c_str(), name.size());

    }

    size_t key_len;

    const auto key16 = parser_.getAttributeName(index, &key_len);

    return key16 && name16.size() == key_len && name16 == key16;

  });

}