Keep blob: URLs containing file: origins as an exercise for the reader

[annevk]

Blocklisting blob: URLs containing a file: origin from getting a proper origin was a bridge too far. See #506 for a slightly less ambitious approach that could still work.

Closes #775.

• [x] At least two implementers are interested (and none opposed):
  • WebKit
  • Chromium
• [x] Tests are written and can be reviewed and commented upon at:
  • https://github.com/web-platform-tests/wpt/pull/41158
• [x] Implementation bugs are filed:
  • Chromium: https://bugs.chromium.org/p/chromium/issues/detail?id=1448562
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1834703
  • WebKit: https://bugs.webkit.org/show_bug.cgi?id=257262
  • Deno: https://github.com/denoland/deno/issues/19241
  • Node.js: https://github.com/nodejs/node/issues/48904
• [x] MDN issue is filed: N/A

(See WHATWG Working Mode: Changes for more details.)

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[annevk]

@canadahonk I suppose Gecko is supportive?

[CanadaHonk]

I agree but I don't represent Gecko, not sure who to ping for this either.

[annevk]

@valenting or @ricea?

[ricea]

Chromium is supportive (because it moves our implementation closer to compliance).