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This is similar to crrev.com/c/1999974 but for
FindRegistrationForId{,Only}().

ServiceWorkerStorage::DidFindRegistrationForId() became identical
to DidFindRegistration() so it was merged into a single method.

This CL also changes some tests not to use
ServiceWorkerStorage directly. Use ServiceWorkerRegistry
instead.

FindInstallingRegistrationXXX() are now private methods because
ServiceWorkerStorage doesn't use them anymore.

Bug: 1039200
Change-Id: Ia218afc7109b5f697933956719890442de68d51a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2004350Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732671}