[whatwg/fetch] Can't add Authorization on Request Header with Chrome 57.0.2987 (#509)

**Chrome version**: 57.0.2987

Actually, in older Chrome version I also have this problem.
I added `Authorization` on Request Header with my access token,
```
{
    headers: {
                    'Authorization': 'Bearer ' + accesstoken
                }
}
```
I always get `Access-Control-Allow-Headers:authorization` in Chrome
Besides, My fetch is always Request Method:**OPTIONS** (not display get), then `Status Code` is 200 OK in Chrome

But if I run the same fetch code in Firefox (ver 52.0.1 ), everything works great. I can add `Authorization` on Request Header correctly. It will display `Authorization: Bearer  accesstoken` on Request header.

The server side already processed CORS for my request header..

This is a Chrome bug or my code fault? How should I do to make `Authorization` on Request Header correctly?


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