diff --git a/dom/base/nsObjectLoadingContent.cpp b/dom/base/nsObjectLoadingContent.cpp
index 50593b54e7ef..c52f61abf8eb 100644
--- a/dom/base/nsObjectLoadingContent.cpp
+++ b/dom/base/nsObjectLoadingContent.cpp
@@ -416,11 +416,6 @@ nsObjectLoadingContent::OnDataAvailable(nsIRequest* aRequest,
   return NS_ERROR_UNEXPECTED;
 }
 
-void nsObjectLoadingContent::PresetOpenerWindow(
-    const Nullable<WindowProxyHolder>& aOpenerWindow, ErrorResult& aRv) {
-  aRv.Throw(NS_ERROR_FAILURE);
-}
-
 NS_IMETHODIMP
 nsObjectLoadingContent::GetActualType(nsACString& aType) {
   aType = mContentType;
@@ -1821,22 +1816,6 @@ Document* nsObjectLoadingContent::GetContentDocument(
   return sub_doc;
 }
 
-bool nsObjectLoadingContent::DoResolve(
-    JSContext* aCx, JS::Handle<JSObject*> aObject, JS::Handle<jsid> aId,
-    JS::MutableHandle<mozilla::Maybe<JS::PropertyDescriptor>> aDesc) {
-  return true;
-}
-
-/* static */
-bool nsObjectLoadingContent::MayResolve(jsid aId) {
-  // We can resolve anything, really.
-  return true;
-}
-
-void nsObjectLoadingContent::GetOwnPropertyNames(
-    JSContext* aCx, JS::MutableHandleVector<jsid> /* unused */,
-    bool /* unused */, ErrorResult& aRv) {}
-
 void nsObjectLoadingContent::MaybeFireErrorEvent() {
   Element* el = AsElement();
   // Queue a task to fire an error event if we're an <object> element.  The
diff --git a/dom/base/nsObjectLoadingContent.h b/dom/base/nsObjectLoadingContent.h
index 296e4a384668..03c7249fb60e 100644
--- a/dom/base/nsObjectLoadingContent.h
+++ b/dom/base/nsObjectLoadingContent.h
@@ -74,22 +74,8 @@ class nsObjectLoadingContent : public nsIStreamListener,
   }
 
   static bool IsFallbackMimeType(const nsACString& aMimeType);
-
-  // Helper for WebIDL NeedResolve
-  bool DoResolve(
-      JSContext* aCx, JS::Handle<JSObject*> aObject, JS::Handle<jsid> aId,
-      JS::MutableHandle<mozilla::Maybe<JS::PropertyDescriptor>> aDesc);
-  // The return value is whether DoResolve might end up resolving the given
-  // id.  If in doubt, return true.
-  static bool MayResolve(jsid aId);
-
   static bool IsSuccessfulRequest(nsIRequest*, nsresult* aStatus);
 
-  // Helper for WebIDL enumeration
-  void GetOwnPropertyNames(JSContext* aCx,
-                           JS::MutableHandleVector<jsid> /* unused */,
-                           bool /* unused */, mozilla::ErrorResult& aRv);
-
   // WebIDL API
   mozilla::dom::Document* GetContentDocument(nsIPrincipal& aSubjectPrincipal);
   void GetActualType(nsAString& aType) const {
@@ -113,10 +99,6 @@ class nsObjectLoadingContent : public nsIStreamListener,
 
   bool IsRewrittenYoutubeEmbed() const { return mRewrittenYoutubeEmbed; }
 
-  void PresetOpenerWindow(const mozilla::dom::Nullable<
-                              mozilla::dom::WindowProxyHolder>& aOpenerWindow,
-                          mozilla::ErrorResult& aRv);
-
   const mozilla::Maybe<mozilla::IntrinsicSize>& GetSubdocumentIntrinsicSize()
       const {
     return mSubdocumentIntrinsicSize;
diff --git a/dom/webidl/HTMLEmbedElement.webidl b/dom/webidl/HTMLEmbedElement.webidl
index be0694da3a32..e02484b1fbc7 100644
--- a/dom/webidl/HTMLEmbedElement.webidl
+++ b/dom/webidl/HTMLEmbedElement.webidl
@@ -13,8 +13,7 @@
  */
 
 // http://www.whatwg.org/specs/web-apps/current-work/#the-embed-element
-[NeedResolve,
- Exposed=Window]
+[Exposed=Window]
 interface HTMLEmbedElement : HTMLElement {
   [HTMLConstructor] constructor();
 
diff --git a/dom/webidl/HTMLObjectElement.webidl b/dom/webidl/HTMLObjectElement.webidl
index 559052a092bc..0e68de29b86d 100644
--- a/dom/webidl/HTMLObjectElement.webidl
+++ b/dom/webidl/HTMLObjectElement.webidl
@@ -13,8 +13,7 @@
  */
 
 // http://www.whatwg.org/specs/web-apps/current-work/#the-object-element
-[NeedResolve,
- Exposed=Window]
+[Exposed=Window]
 interface HTMLObjectElement : HTMLElement {
   [HTMLConstructor] constructor();