I am on Oreo 8.0.0 and couldn't find a setting for this so ended up using this Hide "running in the background" Notification
I have several apps running in background and disabled them all using this app, as it serves no useful purpose for me to know
Auto Notification is another app that has this feature amongst other Tasker oriented features if you are ...
Long press/Hold the application name is running in the background and toggle the switch available, like seen in the below screenshot (option is currently enabled, turn it off to disable the running in background notification)
Or you can go to Settings > Notifications (enable show system apps option found in menu) > Android System > Disable Apps running in ...
Even though I noticed it only now, the change was introduced in Android 7 Nougat itself. Chrome will take over its place.
Read beeshyams answer for further info.
If I go to apps manager and disable Chrome, then the Webview app is automatically enabled, and can be updated from Play Store.
If I enable Chrome, WebView is automatically disabled again.
Update April 23, 2018: I just found it possible to unlock the bootloader for certain HMD Nokia phones, according to this post on XDA forum.
Do it at your own risk.
So far HMD Nokia is not root-able, that's because HMD doesn't want to let the bootloader of Nokia 8 be unlockable. Without an unlocked bootloader, it's impossible to root a device (let alone ...