Bug 1323721 part 6. Remove the now-unused Promise::WrapObject. r=till

dom/promise/Promise.cpp

@@ -91,18 +91,6 @@ Promise::~Promise()
   mozilla::DropJSObjects(this);
 }
 
-
-bool
-Promise::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto,
-                    JS::MutableHandle<JSObject*> aWrapper)
-{
-#ifdef DEBUG
-  binding_detail::AssertReflectorHasGivenProto(aCx, mPromiseObj, aGivenProto);
-#endif // DEBUG
-  aWrapper.set(mPromiseObj);
-  return true;
-}
-
 // static
 already_AddRefed<Promise>
 Promise::Create(nsIGlobalObject* aGlobal, ErrorResult& aRv)

dom/promise/Promise.h

@@ -120,10 +120,6 @@ public:
     return mGlobal;
   }
 
-  bool
-  WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto,
-             JS::MutableHandle<JSObject*> aWrapper);
-
   // Do the equivalent of Promise.resolve in the current compartment of aCx.
   // Errorrs are reported on the ErrorResult; if aRv comes back !Failed(), this
   // function MUST return a non-null value.