Re: [whatwg/fetch] blob url fetch with no mime type set is undefined (Issue #1436)

Hey @dlrobertson, thank you for looking into this.

Looking at https://w3c.github.io/FileAPI/ and https://fetch.spec.whatwg.org/#concept-scheme-fetch Safari would be correct here. I could see adopting Chromium's behavior whereby we special case the empty string value though and not set the `Content-Type` header in that case, especially as the empty string does not end up parsing like a successful MIME type according to https://mimesniff.spec.whatwg.org/#parse-a-mime-type.

Making up a MIME type as Firefox does could be acceptable, but seems a little weird and non-standard.

@youennf @KershawChang thoughts?

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