George Kalpakas d1abf4e897 test(service-worker): improve adding clients in SwTestHarness (#23625)
This commits changes how clients are added in `SwTestHarness`, so that
the behavior in tests closer mimics what would happen in an actual
ServiceWorker.
It also removes auto-adding clients when calling `clients.get()`, which
could hide bugs related to non-existing clients.

PR Close #23625
2018-05-09 11:50:02 -07:00
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