--- a/dom/bindings/BindingUtils.h
+++ b/dom/bindings/BindingUtils.h
@@ -41,25 +41,16 @@
 
 class nsIJSID;
 class nsPIDOMWindow;
 
 namespace mozilla {
 namespace dom {
 template<typename DataType> class MozMap;
 
-struct SelfRef
-{
-  SelfRef() : ptr(nullptr) {}
-  explicit SelfRef(nsISupports *p) : ptr(p) {}
-  ~SelfRef() { NS_IF_RELEASE(ptr); }
-
-  nsISupports* ptr;
-};
-
 nsresult
 UnwrapArgImpl(JS::Handle<JSObject*> src, const nsIID& iid, void** ppArg);
 
 /** Convert a jsval to an XPCOM pointer. */
 template <class Interface>
 inline nsresult
 UnwrapArg(JS::Handle<JSObject*> src, Interface** ppArg)
 {