[slightlyoff/ServiceWorker] Update for changes to HTML's script-fetching algorithms (#923)

In https://github.com/whatwg/html/pull/1487, HTML's script-fetching algorithms were updated and improved. This aligns service worker, which is a heavy consumer of those algorithms, with those changes.

DO NOT MERGE YET. This relies on https://github.com/whatwg/html/pull/1487 first being merged, and then on a day or two for Shepherd to scrape HTML's newly-exported `<dfn>`s, and then I have to rebuild the .html. But feel free to review!!
You can view, comment on, or merge this pull request online at:

  https://github.com/slightlyoff/ServiceWorker/pull/923

-- Commit Summary --

  * Update for changes to HTML's script-fetching algorithms

-- File Changes --

    M spec/service_worker/index.bs (78)
    M spec/service_worker/index.html (117)

-- Patch Links --

https://github.com/slightlyoff/ServiceWorker/pull/923.patch
https://github.com/slightlyoff/ServiceWorker/pull/923.diff

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