diff --git a/dom/u2f/U2FManager.h b/dom/u2f/U2FManager.h
index effd447efb31..b7b6a5cfd2a8 100644
--- a/dom/u2f/U2FManager.h
+++ b/dom/u2f/U2FManager.h
@@ -59,15 +59,11 @@ class U2FManager final : public nsIIPCBackgroundChildCreateCallback
 public:
   NS_DECL_ISUPPORTS
   NS_DECL_NSIDOMEVENTLISTENER
+  NS_DECL_NSIIPCBACKGROUNDCHILDCREATECALLBACK
+
   static U2FManager* GetOrCreate();
   static U2FManager* Get();
 
-  void FinishRegister(nsTArray<uint8_t>& aRegBuffer);
-  void FinishSign(nsTArray<uint8_t>& aCredentialId,
-                  nsTArray<uint8_t>& aSigBuffer);
-  void Cancel(const nsresult& aError);
-  void RequestAborted(const nsresult& aError);
-
   already_AddRefed<U2FPromise> Register(nsPIDOMWindowInner* aParent,
               const nsCString& aRpId,
               const nsCString& aClientDataJSON,
@@ -79,18 +75,23 @@ public:
               const uint32_t& aTimeoutMillis,
               const nsTArray<WebAuthnScopedCredentialDescriptor>& aKeyList);
 
-  void StartRegister();
-  void StartSign();
-  void StartCancel();
+  void FinishRegister(nsTArray<uint8_t>& aRegBuffer);
+  void FinishSign(nsTArray<uint8_t>& aCredentialId,
+                  nsTArray<uint8_t>& aSigBuffer);
+  void RequestAborted(const nsresult& aError);
+
+  void Cancel(const nsresult& aError);
 
-  // nsIIPCbackgroundChildCreateCallback methods
-  void ActorCreated(PBackgroundChild* aActor) override;
-  void ActorFailed() override;
   void ActorDestroyed();
+
 private:
   U2FManager();
   virtual ~U2FManager();
 
+  void StartRegister();
+  void StartSign();
+  void StartCancel();
+
   void MaybeClearTransaction();
   nsresult PopulateTransactionInfo(const nsCString& aRpId,
                     const nsCString& aClientDataJSON,
diff --git a/dom/webauthn/WebAuthnManager.h b/dom/webauthn/WebAuthnManager.h
index b6d559afb04a..ca2565401874 100644
--- a/dom/webauthn/WebAuthnManager.h
+++ b/dom/webauthn/WebAuthnManager.h
@@ -68,9 +68,19 @@ class WebAuthnManager final : public nsIIPCBackgroundChildCreateCallback,
 public:
   NS_DECL_ISUPPORTS
   NS_DECL_NSIDOMEVENTLISTENER
+  NS_DECL_NSIIPCBACKGROUNDCHILDCREATECALLBACK
+
   static WebAuthnManager* GetOrCreate();
   static WebAuthnManager* Get();
 
+  already_AddRefed<Promise>
+  MakeCredential(nsPIDOMWindowInner* aParent,
+                 const MakePublicKeyCredentialOptions& aOptions);
+
+  already_AddRefed<Promise>
+  GetAssertion(nsPIDOMWindowInner* aParent,
+               const PublicKeyCredentialRequestOptions& aOptions);
+
   void
   FinishMakeCredential(nsTArray<uint8_t>& aRegBuffer);
 
@@ -81,26 +91,16 @@ public:
   void
   RequestAborted(const nsresult& aError);
 
-  already_AddRefed<Promise>
-  MakeCredential(nsPIDOMWindowInner* aParent,
-                 const MakePublicKeyCredentialOptions& aOptions);
+  void ActorDestroyed();
 
-  already_AddRefed<Promise>
-  GetAssertion(nsPIDOMWindowInner* aParent,
-               const PublicKeyCredentialRequestOptions& aOptions);
+private:
+  WebAuthnManager();
+  virtual ~WebAuthnManager();
 
   void StartRegister();
   void StartSign();
   void StartCancel();
 
-  // nsIIPCbackgroundChildCreateCallback methods
-  void ActorCreated(PBackgroundChild* aActor) override;
-  void ActorFailed() override;
-  void ActorDestroyed();
-private:
-  WebAuthnManager();
-  virtual ~WebAuthnManager();
-
   void Cancel(const nsresult& aError);
   void MaybeClearTransaction();