1 files changed, 11 insertions, 10 deletions
diff --git a/components/script/dom/cssgroupingrule.rs b/components/script/dom/cssgroupingrule.rs
index cd55cd358b6..7176dda8d12 100644
--- a/components/script/dom/cssgroupingrule.rs
+++ b/components/script/dom/cssgroupingrule.rs
@@ -4,7 +4,6 @@
 
 use dom::bindings::codegen::Bindings::CSSGroupingRuleBinding;
 use dom::bindings::codegen::Bindings::CSSGroupingRuleBinding::CSSGroupingRuleMethods;
-use dom::bindings::codegen::Bindings::CSSRuleBinding::CSSRuleBinding::CSSRuleMethods;
 use dom::bindings::error::{ErrorResult, Fallible};
 use dom::bindings::inheritance::Castable;
 use dom::bindings::js::{JS, MutNullableHeap, Root};
@@ -14,38 +13,40 @@ use dom::cssrule::CSSRule;
 use dom::cssrulelist::{CSSRuleList, RulesSource};
 use dom::cssstylesheet::CSSStyleSheet;
 use dom::window::Window;
+use parking_lot::RwLock;
+use std::sync::Arc;
 use style::stylesheets::CssRules as StyleCssRules;
 
 #[dom_struct]
 pub struct CSSGroupingRule {
     cssrule: CSSRule,
     #[ignore_heap_size_of = "Arc"]
-    rules: StyleCssRules,
+    rules: Arc<RwLock<StyleCssRules>>,
     rulelist: MutNullableHeap<JS<CSSRuleList>>,
 }
 
 impl CSSGroupingRule {
-    pub fn new_inherited(parent: Option<&CSSStyleSheet>,
-                         rules: StyleCssRules) -> CSSGroupingRule {
+    pub fn new_inherited(parent_stylesheet: &CSSStyleSheet,
+                         rules: Arc<RwLock<StyleCssRules>>) -> CSSGroupingRule {
         CSSGroupingRule {
-            cssrule: CSSRule::new_inherited(parent),
+            cssrule: CSSRule::new_inherited(parent_stylesheet),
             rules: rules,
             rulelist: MutNullableHeap::new(None),
         }
     }
 
     #[allow(unrooted_must_root)]
-    pub fn new(window: &Window, parent: Option<&CSSStyleSheet>, rules: StyleCssRules) -> Root<CSSGroupingRule> {
-        reflect_dom_object(box CSSGroupingRule::new_inherited(parent, rules),
+    pub fn new(window: &Window, parent_stylesheet: &CSSStyleSheet,
+               rules: Arc<RwLock<StyleCssRules>>) -> Root<CSSGroupingRule> {
+        reflect_dom_object(box CSSGroupingRule::new_inherited(parent_stylesheet, rules),
                            window,
                            CSSGroupingRuleBinding::Wrap)
     }
 
     fn rulelist(&self) -> Root<CSSRuleList> {
-        let sheet = self.upcast::<CSSRule>().GetParentStyleSheet();
-        let sheet = sheet.as_ref().map(|s| &**s);
+        let parent_stylesheet = self.upcast::<CSSRule>().parent_stylesheet();
         self.rulelist.or_init(|| CSSRuleList::new(self.global().as_window(),
-                                                  sheet,
+                                                  parent_stylesheet,
                                                   RulesSource::Rules(self.rules.clone())))
     }
 }