Bug 1621476 - Disable WebAuthn on GeckoView r=jcj

We'll enable it once it's actually supported.

Differential Revision: https://phabricator.services.mozilla.com/D66401

--HG--
extra : moz-landing-system : lando

mobile/android/app/geckoview-prefs.js

@@ -72,6 +72,7 @@ pref("ui.android.mouse_as_touch", 2);
 
 // Fenix is currently not whitelisted for Web Authentication
 pref("security.webauth.webauthn_enable_android_fido2", false);
+pref("security.webauth.webauthn", false);
 
 // Enable autoplay permission prompts
 pref("media.geckoview.autoplay.request", true);