Re: [xhr-tests] XMLHttpRequest: update Document serialization test (#5123)

These tests are now available on [w3c-test.org](https://w3c-test.org/submissions/5123/)

View on GitHub: https://github.com/w3c/web-platform-tests/pull/5123#issuecomment-286113734

Received on Monday, 13 March 2017 13:56:32 UTC