Bug 1579824 - Stop overriding system colors via prefs. r=snorp

Depends on D69938

Differential Revision: https://phabricator.services.mozilla.com/D69939

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

mobile/android/app/mobile.js

@@ -398,36 +398,6 @@ pref("security.cert_pinning.enforcement_level", 1);
 // Only fetch OCSP for EV certificates
 pref("security.OCSP.enabled", 2);
 
-// Override some named colors to avoid inverse OS themes
-pref("ui.-moz-dialog", "#efebe7");
-pref("ui.-moz-dialogtext", "#101010");
-pref("ui.-moz-field", "#fff");
-pref("ui.-moz-fieldtext", "#1a1a1a");
-pref("ui.-moz-buttonhoverface", "#f3f0ed");
-pref("ui.-moz-buttonhovertext", "#101010");
-pref("ui.-moz-combobox", "#fff");
-pref("ui.-moz-comboboxtext", "#101010");
-pref("ui.buttonface", "#ece7e2");
-pref("ui.buttonhighlight", "#fff");
-pref("ui.buttonshadow", "#aea194");
-pref("ui.buttontext", "#101010");
-pref("ui.captiontext", "#101010");
-pref("ui.graytext", "#b1a598");
-pref("ui.highlight", "#fad184");
-pref("ui.highlighttext", "#1a1a1a");
-pref("ui.infobackground", "#f5f5b5");
-pref("ui.infotext", "#000");
-pref("ui.menu", "#f7f5f3");
-pref("ui.menutext", "#101010");
-pref("ui.threeddarkshadow", "#000");
-pref("ui.threedface", "#ece7e2");
-pref("ui.threedhighlight", "#fff");
-pref("ui.threedlightshadow", "#ece7e2");
-pref("ui.threedshadow", "#aea194");
-pref("ui.window", "#efebe7");
-pref("ui.windowtext", "#101010");
-pref("ui.windowframe", "#efebe7");
-
 /* prefs used by the update timer system (including blocklist pings) */
 pref("app.update.timerFirstInterval", 30000); // milliseconds
 pref("app.update.timerMinimumDelay", 30); // seconds