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This specifically reduces duplication between
ClearSiteDataHandlerBrowserTest and SameSiteDataRemoverBrowserTest
related to creating and retrieving service workers.

Bug: 987177
Change-Id: Iaa5f772e61e0ca73cceaff56fdaf9c370390dfeb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1751202
Commit-Queue: Jenny Blessing <jblessing@google.com>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690775}