Avoid using the page visibility change steps hook

[anssiko]

From https://html.spec.whatwg.org/#update-the-visibility-state

It would be better if specification authors sent a pull request to add calls from here into their specifications directly, instead of using the page visibility change steps hook, to ensure well-defined cross-specification call order. As of the time of this writing the following specifications are known to have page visibility change steps, which will be run in an unspecified order: Device Posture API and Web NFC. [DEVICEPOSTURE] [WEBNFC]

[kenchris]

Related to #95