--- a/dom/xul/nsXULElement.h
+++ b/dom/xul/nsXULElement.h
@@ -119,21 +119,16 @@ public:
     virtual nsresult Serialize(nsIObjectOutputStream* aStream,
                                nsXULPrototypeDocument* aProtoDoc,
                                const nsTArray<RefPtr<mozilla::dom::NodeInfo>> *aNodeInfos) = 0;
     virtual nsresult Deserialize(nsIObjectInputStream* aStream,
                                  nsXULPrototypeDocument* aProtoDoc,
                                  nsIURI* aDocumentURI,
                                  const nsTArray<RefPtr<mozilla::dom::NodeInfo>> *aNodeInfos) = 0;
 
-#ifdef NS_BUILD_REFCNT_LOGGING
-    virtual const char* ClassName() = 0;
-    virtual uint32_t ClassSize() = 0;
-#endif
-
     /**
      * The prototype document must call ReleaseSubtree when it is going
      * away.  This makes the parents through the tree stop owning their
      * children, whether or not the parent's reference count is zero.
      * Individual elements may still own individual prototypes, but
      * those prototypes no longer remember their children to allow them
      * to be constructed.
      */
@@ -161,21 +156,16 @@ public:
     {
     }
 
     virtual ~nsXULPrototypeElement()
     {
         Unlink();
     }
 
-#ifdef NS_BUILD_REFCNT_LOGGING
-    virtual const char* ClassName() override { return "nsXULPrototypeElement"; }
-    virtual uint32_t ClassSize() override { return sizeof(*this); }
-#endif
-
     virtual void ReleaseSubtree() override
     {
         for (int32_t i = mChildren.Length() - 1; i >= 0; i--) {
             if (mChildren[i].get())
                 mChildren[i]->ReleaseSubtree();
         }
         mChildren.Clear();
         nsXULPrototypeNode::ReleaseSubtree();
@@ -214,21 +204,16 @@ class XULDocument;
 } // namespace mozilla
 
 class nsXULPrototypeScript : public nsXULPrototypeNode
 {
 public:
     nsXULPrototypeScript(uint32_t aLineNo, uint32_t version);
     virtual ~nsXULPrototypeScript();
 
-#ifdef NS_BUILD_REFCNT_LOGGING
-    virtual const char* ClassName() override { return "nsXULPrototypeScript"; }
-    virtual uint32_t ClassSize() override { return sizeof(*this); }
-#endif
-
     virtual nsresult Serialize(nsIObjectOutputStream* aStream,
                                nsXULPrototypeDocument* aProtoDoc,
                                const nsTArray<RefPtr<mozilla::dom::NodeInfo>> *aNodeInfos) override;
     nsresult SerializeOutOfLine(nsIObjectOutputStream* aStream,
                                 nsXULPrototypeDocument* aProtoDoc);
     virtual nsresult Deserialize(nsIObjectInputStream* aStream,
                                  nsXULPrototypeDocument* aProtoDoc,
                                  nsIURI* aDocumentURI,
@@ -293,21 +278,16 @@ public:
         : nsXULPrototypeNode(eType_Text)
     {
     }
 
     virtual ~nsXULPrototypeText()
     {
     }
 
-#ifdef NS_BUILD_REFCNT_LOGGING
-    virtual const char* ClassName() override { return "nsXULPrototypeText"; }
-    virtual uint32_t ClassSize() override { return sizeof(*this); }
-#endif
-
     virtual nsresult Serialize(nsIObjectOutputStream* aStream,
                                nsXULPrototypeDocument* aProtoDoc,
                                const nsTArray<RefPtr<mozilla::dom::NodeInfo>> *aNodeInfos) override;
     virtual nsresult Deserialize(nsIObjectInputStream* aStream,
                                  nsXULPrototypeDocument* aProtoDoc,
                                  nsIURI* aDocumentURI,
                                  const nsTArray<RefPtr<mozilla::dom::NodeInfo>> *aNodeInfos) override;
 
@@ -321,21 +301,16 @@ public:
         : nsXULPrototypeNode(eType_PI)
     {
     }
 
     virtual ~nsXULPrototypePI()
     {
     }
 
-#ifdef NS_BUILD_REFCNT_LOGGING
-    virtual const char* ClassName() override { return "nsXULPrototypePI"; }
-    virtual uint32_t ClassSize() override { return sizeof(*this); }
-#endif
-
     virtual nsresult Serialize(nsIObjectOutputStream* aStream,
                                nsXULPrototypeDocument* aProtoDoc,
                                const nsTArray<RefPtr<mozilla::dom::NodeInfo>> *aNodeInfos) override;
     virtual nsresult Deserialize(nsIObjectInputStream* aStream,
                                  nsXULPrototypeDocument* aProtoDoc,
                                  nsIURI* aDocumentURI,
                                  const nsTArray<RefPtr<mozilla::dom::NodeInfo>> *aNodeInfos) override;