George Kalpakas 4962ef5330 refactor(service-worker): minor refactorings to improve readability/maintainability (#42622)
This commit makes some minor refactorings to improve the code
readability and maintainability, including:
- Avoiding code duplication.
- Using more descriptive variable names.
- Using `async/await` instead of `Promise#then()`.
- Accessing variables directly instead of via `this` when possible.

PR Close #42622
2021-06-24 09:55:32 -07:00
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