diff --git a/components/style/custom_properties.rs b/components/style/custom_properties.rs
index 25066c50c44..03cb886f028 100644
--- a/components/style/custom_properties.rs
+++ b/components/style/custom_properties.rs
@@ -162,7 +162,7 @@ impl CssEnvironment {
         if let Some(var) = ENVIRONMENT_VARIABLES.iter().find(|var| var.name == *name) {
             return Some((var.evaluator)(device));
         }
-        if !device.is_chrome_document() {
+        if !device.chrome_rules_enabled_for_document() {
             return None;
         }
         let var = CHROME_ENVIRONMENT_VARIABLES
diff --git a/components/style/gecko/media_queries.rs b/components/style/gecko/media_queries.rs
index f6a628a2722..c5a5c5723af 100644
--- a/components/style/gecko/media_queries.rs
+++ b/components/style/gecko/media_queries.rs
@@ -559,7 +559,7 @@ impl Device {
     /// This check is consistent with how we enable chrome rules for chrome:// and resource://
     /// stylesheets (and thus chrome:// documents).
     #[inline]
-    pub fn is_chrome_document(&self) -> bool {
-        self.document().mDocURISchemeIsChrome()
+    pub fn chrome_rules_enabled_for_document(&self) -> bool {
+        self.document().mChromeRulesEnabled()
     }
 }