[Desktop] Enable DNS over HTTPS UI setting

[fmarier]

Chromium 84 includes a user-visible DoH setting:

controlled by this feature flag.

[Johann999]

The DOH settings should always be displayed, regardless of whether the flag 'Secure DNS' is set or whether the browser is managed.

[diracdeltas]

We are seeing support requests for this feature now that it's available in Chrome 85 by default: https://twitter.com/Ginger__T/status/1313059566964400129

Is this just waiting on a design from @karenkliu?

[diracdeltas]

We probably just want to copy the Chrome UI for this in brave://settings/security > advanced:

[karenkliu]

let's do what @diracdeltas suggested - probably don't need a design for this one

[diracdeltas]

Seems like this has been fixed. I verified that the setting exists in 1.18 stable and that https://www.cloudflare.com/ssl/encrypted-sni/ shows that DoH is being used once i set the provider to cloudflare 1.1.1.1

[mKoonrad]

I can confirm that it's working on Windows but not on Linux (1.18.77 Chromium: 87.0.4280.101)

[fmarier]

I can confirm that it's working on Windows but not on Linux (1.18.77 Chromium: 87.0.4280.101)

Support for DoH in general is not yet available on Linux (in Chrome or Brave).