Re: [fetch] Should we send an Origin header for no-cors fetches? (#225)

Note that Chrome also includes this header for "navigate" when the method is non-GET. Per @tyoshino in https://github.com/whatwg/xhr/issues/31 @hiroshige-g would look into when exactly we want to include the `Origin` header.

A better design might be to not have this flag and all and instead specify in https://fetch.spec.whatwg.org/#concept-http-network-or-cache-fetch exactly under which conditions it is to be included (request mode "cors", request mode "navigate" and request method non-GET, ...).

@jeisinger might also have thoughts on this.

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