--- a/layout/style/nsStyleStruct.h
+++ b/layout/style/nsStyleStruct.h
@@ -890,21 +890,16 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsSt
   inline bool HasLocalBackground() const;
 
   const nsStyleImageLayers::Layer& BottomLayer() const { return mImage.BottomLayer(); }
 
   nsStyleImageLayers mImage;
   mozilla::StyleComplexColor mBackgroundColor;       // [reset]
 };
 
-#define NS_SPACING_MARGIN   0
-#define NS_SPACING_PADDING  1
-#define NS_SPACING_BORDER   2
-
-
 struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleMargin
 {
   explicit nsStyleMargin(const nsPresContext* aContext);
   nsStyleMargin(const nsStyleMargin& aMargin);
   ~nsStyleMargin() {
     MOZ_COUNT_DTOR(nsStyleMargin);
   }
   void FinishStyle(nsPresContext* aPresContext) {}