From 1f797ca24dcfb153477e6306360f292fab7eaee1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Sun, 14 Jun 2020 23:26:04 +0000
Subject: [PATCH] style: Remove prefers-color-scheme: no-preference.

It was removed from the spec.

Differential Revision: https://phabricator.services.mozilla.com/D78834
---
 components/style/gecko/media_features.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/components/style/gecko/media_features.rs b/components/style/gecko/media_features.rs
index 4d60dc2ff26..a02ddcfd688 100644
--- a/components/style/gecko/media_features.rs
+++ b/components/style/gecko/media_features.rs
@@ -278,6 +278,10 @@ enum PrefersReducedMotion {
     Reduce,
 }
 
+fn color_scheme_no_preference_enabled(_: &crate::parser::ParserContext) -> bool {
+    static_prefs::pref!("layout.css.prefers-color-scheme-no-preference.enabled")
+}
+
 /// Values for the prefers-color-scheme media feature.
 #[derive(Clone, Copy, Debug, FromPrimitive, Parse, PartialEq, ToCss)]
 #[repr(u8)]
@@ -285,6 +289,7 @@ enum PrefersReducedMotion {
 pub enum PrefersColorScheme {
     Light,
     Dark,
+    #[parse(condition = "color_scheme_no_preference_enabled")]
     NoPreference,
 }