1 files changed, 6 insertions, 10 deletions
diff --git a/Source/WebCore/bindings/js/JSMutationCallback.h b/Source/WebCore/bindings/js/JSMutationCallback.h
index d7bd8483b..427d6243a 100644
--- a/Source/WebCore/bindings/js/JSMutationCallback.h
+++ b/Source/WebCore/bindings/js/JSMutationCallback.h
@@ -23,8 +23,7 @@
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef JSMutationCallback_h
-#define JSMutationCallback_h
+#pragma once
 
 #include "ActiveDOMCallback.h"
 #include "DOMWrapperWorld.h"
@@ -37,18 +36,17 @@ namespace WebCore {
 
 class JSDOMGlobalObject;
 
-class JSMutationCallback : public MutationCallback, public ActiveDOMCallback {
+class JSMutationCallback final : public MutationCallback, public ActiveDOMCallback {
 public:
-    static PassRefPtr<JSMutationCallback> create(JSC::JSObject* callback, JSDOMGlobalObject* globalObject)
+    static Ref<JSMutationCallback> create(JSC::JSObject* callback, JSDOMGlobalObject* globalObject)
     {
-        return adoptRef(new JSMutationCallback(callback, globalObject));
+        return adoptRef(*new JSMutationCallback(callback, globalObject));
     }
 
     virtual ~JSMutationCallback();
 
-    virtual void call(const Vector<RefPtr<MutationRecord>>&, MutationObserver*) override;
-
-    virtual ScriptExecutionContext* scriptExecutionContext() const override { return ContextDestructionObserver::scriptExecutionContext(); }
+    void call(const Vector<Ref<MutationRecord>>&, MutationObserver*) override;
+    bool canInvokeCallback() const override { return ActiveDOMCallback::canInvokeCallback(); }
 
 private:
     JSMutationCallback(JSC::JSObject* callback, JSDOMGlobalObject*);
@@ -58,5 +56,3 @@ private:
 };
 
 } // namespace WebCore
-
-#endif