Re: [whatwg/fetch] Propagate URL fragments (#696)

Tentative commit message:
```
Align fragment handling with HTTP

This clarifies how fragment conflicts between the request's current URL 
and the Location header are resolved (the latter wins if non-null). And
how fragment conflicts between the request's current URL and service 
worker response URLs are handled (the former wins). Both are 
irrespective of whether it's a request for a document or subresource.

Tests: https://github.com/web-platform-tests/wpt/pull/27575, 
https://github.com/web-platform-tests/wpt/pull/9604, and 
https://github.com/web-platform-tests/wpt/pull/12680.

HTML change: https://github.com/whatwg/html/pull/6391.

Follow-up: #1167.

Fixes #505.
```

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