--- a/layout/style/CSSStyleSheet.h
+++ b/layout/style/CSSStyleSheet.h
@@ -262,17 +262,16 @@ protected:
   bool                  mInRuleProcessorCache;
   RefPtr<dom::Element> mScopeElement;
 
   CSSStyleSheetInner*   mInner;
 
   AutoTArray<nsCSSRuleProcessor*, 8>* mRuleProcessors;
   nsTArray<nsStyleSet*> mStyleSets;
 
-  friend class ::nsMediaList;
   friend class ::nsCSSRuleProcessor;
   friend class mozilla::StyleSheet;
   friend struct mozilla::ChildSheetListBuilder;
 };
 
 NS_DEFINE_STATIC_IID_ACCESSOR(CSSStyleSheet, NS_CSS_STYLE_SHEET_IMPL_CID)
 
 } // namespace mozilla