The HP Pavilion Chromebook comes with a unique Chrome App named plainly "@HP" which aims to register the Chrome OS device. That's pretty much it.

If you uninstalled it by mistake, you can re-add it by going to the Chrome Web Store at
https://chrome.google.com/webstore/detail/hp/plamffmopddapimaopfdbibfkjpbojbf
If you still have it, right click on it in the App Launcher and click "Remove from Chrome".
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