Make ActiveScriptWrappable the GC mixin it is.

third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class ScriptPromiseResolver;
 
 class MODULES_EXPORT ServiceWorker final : public AbstractWorker, public ActiveScriptWrappable, public WebServiceWorkerProxy {
     DEFINE_WRAPPERTYPEINFO();
+    USING_GARBAGE_COLLECTED_MIXIN(ServiceWorker);
 public:
     static ServiceWorker* from(ExecutionContext*, PassOwnPtr<WebServiceWorker::Handle>);
 
     ~ServiceWorker() override;
+    DECLARE_VIRTUAL_TRACE();
 
     // Eager finalization needed to promptly release owned WebServiceWorker.
     EAGERLY_FINALIZE();
 
-    // Override 'operator new' to enforce allocation of eagerly finalized object.
-    DECLARE_EAGER_FINALIZATION_OPERATOR_NEW();
-
     void postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray&, ExceptionState&);
 
     String scriptURL() const;
     String state() const;
     DEFINE_ATTRIBUTE_EVENT_LISTENER(statechange);
 
     // WebServiceWorkerProxy overrides.
     void dispatchStateChangeEvent() override;
 
     // AbstractWorker overrides.
@@ skipping 11 matching lines @@
     void stop() override;
 
     // A handle to the service worker representation in the embedder.
     OwnPtr<WebServiceWorker::Handle> m_handle;
     bool m_wasStopped;
 };
 
 } // namespace blink
 
 #endif // ServiceWorker_h