[w3c/manifest] Update the Service Worker object to not conflict with SW WebIDL (#654)

Also update to use update_via_cache instead of use_cache due to
changes in Service Worker spec.

Fixes #641
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/654

-- Commit Summary --

  * Update the Service Worker object to not conflict with SW WebIDL

-- File Changes --

    M index.html (65)

-- Patch Links --

https://github.com/w3c/manifest/pull/654.patch
https://github.com/w3c/manifest/pull/654.diff

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