service worker: Don't expose the API to insecure contexts.

Category: Service Worker
Type: New or changed feature
Status: Enabled by default (Chrome 69)
Intent stage: None

Summary

Because of a technical limitation, navigator.serviceWorker was previously exposed on insecure contexts and threw a Security Error when used. After this change, navigator.serviceWorker will return undefined. This aligns with the specification.

Standards & signals

Specification: https://w3c.github.io/ServiceWorker/
Firefox: No signal
Safari: No signal
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=542499

Docs: https://w3c.github.io/webappsec-secure-contexts/#secure-contexts

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