[w3c/manifest] Explicitly block opaque origins from requesting manifests (#638)

This spec change explicitly fails the process of obtaining a manifest if the Document has an opaque origin (i.e. it is sandboxed away from its usual origin).
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/638

-- Commit Summary --

  * Explicitly block opaque origins from requesting manifests

-- File Changes --

    M index.html (11)

-- Patch Links --

https://github.com/w3c/manifest/pull/638.patch
https://github.com/w3c/manifest/pull/638.diff

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