Re: [fetch] The reason why Access-Control-Request-Headers includes simple headers (#249)

My recollection is that I implemented what the spec said at the time when the implementation was written. But that could be wrong.

Generally speaking, I think we should include the headers in `Access-Control-Request-Headers` that we require to be returned in `Access-Control-Allow-Headers`. No more and no less.

So in situations where we require `Access-Control-Allow-Headers` to contain `content-type`, we should also include it in `Access-Control-Request-Headers`.

And if we don't require `accept` in `Access-Control-Allow-Headers`, then we should also not include it in `Access-Control-Request-Headers`.

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