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This refactor condenses service worker test files by converting the
service worker scripts into .any.js WPT files that test both window and
worker contexts.

Change-Id: Iee64f5cc68b939ab02b06910444b8ebffdf359a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851232
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720381}