--- a/layout/style/nsRuleNode.h
+++ b/layout/style/nsRuleNode.h
@@ -39,22 +39,16 @@ public:
   void SetStyleData(nsStyleStructID aSID, nsStyleStruct* aStyleStruct) {
     MOZ_ASSERT(aStyleStruct);
     if (mStyleStructs[aSID] != aStyleStruct) {
       NS_ASSERTION(!mStyleStructs[aSID], "Going to leak style data");
       aStyleStruct->AddRef();
       mStyleStructs[aSID] = aStyleStruct;
     }
   }
-  bool ClearStyleData(nsStyleStructID aSID) {
-    bool shouldDelete = mStyleStructs[aSID] &&
-                        mStyleStructs[aSID]->ReleaseWithoutDestroying() == 0;
-    mStyleStructs[aSID] = nullptr;
-    return shouldDelete;
-  }
   bool ReplaceStyleData(nsStyleStructID aSID, nsStyleStruct* aStyleStruct) {
     MOZ_ASSERT(aStyleStruct);
     nsStyleStruct* old = mStyleStructs[aSID];
     aStyleStruct->AddRef();
     mStyleStructs[aSID] = aStyleStruct;
     return old && old->ReleaseWithoutDestroying() == 0;
   }
 
@@ -106,22 +100,16 @@ public:
   void SetStyleData(nsStyleStructID aSID, nsStyleStruct* aStyleStruct) {
     MOZ_ASSERT(aStyleStruct);
     if (mStyleStructs[aSID] != aStyleStruct) {
       NS_ASSERTION(!mStyleStructs[aSID], "Going to leak style data");
       aStyleStruct->AddRef();
       mStyleStructs[aSID] = aStyleStruct;
     }
   }
-  bool ClearStyleData(nsStyleStructID aSID) {
-    bool shouldDelete = mStyleStructs[aSID] &&
-                        mStyleStructs[aSID]->ReleaseWithoutDestroying() == 0;
-    mStyleStructs[aSID] = nullptr;
-    return shouldDelete;
-  }
   bool ReplaceStyleData(nsStyleStructID aSID, nsStyleStruct* aStyleStruct) {
     MOZ_ASSERT(aStyleStruct);
     nsStyleStruct* old = mStyleStructs[aSID];
     aStyleStruct->AddRef();
     mStyleStructs[aSID] = aStyleStruct;
     return old && old->ReleaseWithoutDestroying() == 0;
   }