Stop censoring responseURL's fragment

[aliolean19]

See https://github.com/whatwg/fetch/issues/505.

Tests: ...

Corresponding Fetch PR: https://github.com/whatwg/fetch/pull/696.

• [x] At least two implementers are interested (and none opposed):
  • …
  • …
• [x] Tests are written and can be reviewed and commented upon at:
  • …
• [ ] Implementation bugs are filed:
  • Chrome: …
  • Firefox: …
  • Safari: …

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

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