Re: [service-workers-tests] [service-workers] Avoid race condition in test (#4879)

Notifying @ehsan and @mkruisselbrink. *([Learn how reviewing works](https://github.com/w3c/web-platform-tests/blob/master/README.md#test-review).)*

View on GitHub: https://github.com/w3c/web-platform-tests/pull/4879#issuecomment-280180722

Received on Wednesday, 15 February 2017 23:50:55 UTC