[whatwg/xhr] Synchronous XMLHttpRequest (#69)

Hello

My checkout page won't continue because i have the following error :
![image](https://cloud.githubusercontent.com/assets/18028151/14836372/e3fdb150-0c0f-11e6-8f86-d4c4809798e0.png)

Any idea?


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Received on Tuesday, 26 April 2016 22:35:45 UTC