Re: [whatwg/xhr] Web compat implications of making getAllResponseHeaders lowercase (#146)

This broke one of our tools.  It was especially confusing to debug as the http header was in fact "Content-Type" on the response. 

```
var isJsonResp = response.headers["Content-Type"] == "application/json";
var resp = {
     data: isJsonResp ? JSON.parse(response.data) : response.data,
```


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