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diff --git a/dom/reporting/TestingDeprecatedInterface.h b/dom/reporting/TestingDeprecatedInterface.h
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+++ b/dom/reporting/TestingDeprecatedInterface.h
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_TestingDeprecatedInterface_h
+#define mozilla_dom_TestingDeprecatedInterface_h
+
+#include "js/TypeDecls.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/Assertions.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsISupports.h"
+#include "nsWrapperCache.h"
+
+class nsIGlobalObject;
+
+namespace mozilla::dom {
+class GlobalObject;
+
+class TestingDeprecatedInterface final : public nsISupports,
+                                         public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(TestingDeprecatedInterface)
+
+  static already_AddRefed<TestingDeprecatedInterface> Constructor(
+      const GlobalObject& aGlobal);
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  nsIGlobalObject* GetParentObject() const { return mGlobal; }
+
+  void DeprecatedMethod() const;
+
+  bool DeprecatedAttribute() const;
+
+ private:
+  explicit TestingDeprecatedInterface(nsIGlobalObject* aGlobal);
+  ~TestingDeprecatedInterface();
+
+  nsCOMPtr<nsIGlobalObject> mGlobal;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_TestingDeprecatedInterface_h