Prevent browser detection via navigator.plugins

[luixxiul]

Describe the issue you encountered:
See the thread: https://twitter.com/xopek59/status/879354346311471105
Also: https://github.com/gaborgulyas/are_you_brave

The issue seems to have been fixed with #8365, while I am not sure if the code reported on the tweet is blocked.

• Brave Version (revision SHA): 0.16.9

• Extra QA steps:
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• Any related issues:

[jonathansampson]

@luixxiul Dupe of this, no? #8323

[luixxiul]

I think so, if this code does not detect the browser:

if(Object.getOwnPropertyDescriptor(Object.getPrototypeOf(navigator), "plugins").get.toString().indexOf("native") == -1) {
// brave
}

See the tweet above.