ServiceWorker

c565ecf9 - Parse URLs relative to the relevant settings object, not entry

Parse URLs relative to the relevant settings object, not entry Fixes #922. Web platform tests at https://github.com/w3c/web-platform-tests/pull/3449. Part of the overall effort in https://github.com/whatwg/html/issues/1431. In the process, fixes some ambiguity about how to parse URLs in the Link header, as previous it parsed relative to the entry settings object, which did not exist during this algorithm.