[whatwg/fetch] Only allow blob: URLs that point to Blob objects (#708)

The reason this works is that https://html.spec.whatwg.org/#concept-media-load-resource (HTML's media element fetching algorithm) special cases MediaSource and MediaStream and handles them way before Fetch is hit.

Tests: ...

Fixes #457.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/708

-- Commit Summary --

  * Only allow blob: URLs that point to Blob objects

-- File Changes --

    M fetch.bs (6)

-- Patch Links --

https://github.com/whatwg/fetch/pull/708.patch
https://github.com/whatwg/fetch/pull/708.diff

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