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

> Could either of you check if any of the regressions in https://bugzilla.mozilla.org/showdependencytree.cgi?id=1370485&maxdepth=1&hide_resolved=0 apply to Chrome 60, do those sites still assume a certain casing, and is the code reachable for Chromium? Anything that would prevent Gecko from eventually relanding the change would be bad news for interop here.

* ExHentai Easy 2: the bug's in the Firefox extension. The code there's still case-sensitive.
* bilibili: a new version of their main `app_bla.js` seems to have been deployed; it worked fine on both Chrome 60 and Firefox 54.
* Nike's japanese page: that specific product no longer exists. I tried opening another random product page with Chrome 60 and it worked fine. The recommendations for other products that's shown in that page that no longer exists is broken in Chrome 60 though, but I think it's unrelated to this change (I get several security errors when the page tries to access `localStorage`).

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