George Kalpakas 7df1fa5411 refactor(service-worker): make SwTestHarness.envIsSupported() a standalone function (#42736)
This commit makes the `SwTestHarness.envIsSupported()` static method a
standalone function. This function is used to determine whether the
current environment provides the necessary APIs to run the SW tests and
is independent of `SwTestHarness`, so is no need for it to be a static
method of `SwTestHarness`.

This is in preparation of switching from our custom typings to the
official TypeScript typings (`lib.webworker.d.ts`).

PR Close #42736
2021-07-08 10:28:22 -07:00
..