Re: [xhr] Make setRequestHeader() normalize header values just like Fetch does and update HTTP references. Fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=27797 (90c79d0)

There have been reports of the implementation of this change breaking some applications in iOS9 (as opposed to iOS8 and everywhere else) --- caused by https://github.com/WebKit/webkit/commit/52807831aa6d02414054dfc90569b6c7e2a93783

Just FYI, it may not have been totally safe, because authors are doing things like `"Bearer " + <some user defined value>` for authorization headers.

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