--- a/dom/xbl/XBLChildrenElement.cpp
+++ b/dom/xbl/XBLChildrenElement.cpp
@@ -21,28 +21,16 @@ NS_IMPL_RELEASE_INHERITED(XBLChildrenEle
 NS_INTERFACE_TABLE_HEAD(XBLChildrenElement)
   NS_INTERFACE_TABLE_INHERITED(XBLChildrenElement, nsIDOMNode,
                                nsIDOMElement)
   NS_ELEMENT_INTERFACE_TABLE_TO_MAP_SEGUE
 NS_INTERFACE_MAP_END_INHERITING(Element)
 
 NS_IMPL_ELEMENT_CLONE(XBLChildrenElement)
 
-nsIAtom*
-XBLChildrenElement::GetIDAttributeName() const
-{
-  return nullptr;
-}
-
-nsIAtom*
-XBLChildrenElement::DoGetID() const
-{
-  return nullptr;
-}
-
 nsresult
 XBLChildrenElement::UnsetAttr(int32_t aNameSpaceID, nsIAtom* aAttribute,
                               bool aNotify)
 {
   if (aAttribute == nsGkAtoms::includes &&
       aNameSpaceID == kNameSpaceID_None) {
     mIncludes.Clear();
   }

--- a/dom/xbl/XBLChildrenElement.h
+++ b/dom/xbl/XBLChildrenElement.h
@@ -30,31 +30,27 @@ public:
     : nsXMLElement(aNodeInfo)
   {
   }
 
   // nsISupports
   NS_DECL_ISUPPORTS_INHERITED
 
   // nsINode interface methods
-  virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const;
+  virtual nsresult Clone(mozilla::dom::NodeInfo* aNodeInfo, nsINode** aResult) const MOZ_OVERRIDE;
 
-  virtual nsXPCClassInfo* GetClassInfo() { return nullptr; }
-
-  virtual nsIDOMNode* AsDOMNode() { return this; }
+  virtual nsIDOMNode* AsDOMNode() MOZ_OVERRIDE { return this; }
 
   // nsIContent interface methods
-  virtual nsIAtom *GetIDAttributeName() const;
-  virtual nsIAtom* DoGetID() const;
   virtual nsresult UnsetAttr(int32_t aNameSpaceID, nsIAtom* aAttribute,
-                             bool aNotify);
+                             bool aNotify) MOZ_OVERRIDE;
   virtual bool ParseAttribute(int32_t aNamespaceID,
                               nsIAtom* aAttribute,
                               const nsAString& aValue,
-                              nsAttrValue& aResult);
+                              nsAttrValue& aResult) MOZ_OVERRIDE;
 
   void AppendInsertedChild(nsIContent* aChild)
   {
     mInsertedChildren.AppendElement(aChild);
     aChild->SetXBLInsertionParent(GetParent());
 
     // Appending an inserted child causes the inserted
     // children to be projected instead of default content.
@@ -171,19 +167,19 @@ public:
   }
 
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsAnonymousContentList)
   // nsIDOMNodeList interface
   NS_DECL_NSIDOMNODELIST
 
   // nsINodeList interface
-  virtual int32_t IndexOf(nsIContent* aContent);
-  virtual nsINode* GetParentObject() { return mParent; }
-  virtual nsIContent* Item(uint32_t aIndex);
+  virtual int32_t IndexOf(nsIContent* aContent) MOZ_OVERRIDE;
+  virtual nsINode* GetParentObject() MOZ_OVERRIDE { return mParent; }
+  virtual nsIContent* Item(uint32_t aIndex) MOZ_OVERRIDE;
 
   virtual JSObject* WrapObject(JSContext *cx) MOZ_OVERRIDE;
 
   bool IsListFor(nsIContent* aContent) {
     return mParent == aContent;
   }
 
 private: