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Make service_worker_storage_unittest.cc ready to move

This CL removes //content dependencies from
service_worker_storage_unittest.cc so that it can be moved to the
Storage Service directory. Summary:
* Replace EmbeddedTestHelper with ServiceWorkerStorage
* Replace BrowserTaskEnvironment with base::TaskEnvironment
* Remove helper functions which are no longer used
* Rename some helper functions

Bug: 1016064
Change-Id: Ia458ccb9da23ed722051aae6c72bfb5efb81e31d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473785
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818767}