Oilpan: dispose ServiceWorker (and registration) objects earlier.

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 29 matching lines @@
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 class ScriptPromiseResolver;
 
 class ServiceWorker final : public AbstractWorker, public WebServiceWorkerProxy {
     DEFINE_WRAPPERTYPEINFO();
+    WILL_BE_USING_PRE_FINALIZER(ServiceWorker, dispose);
 public:
     // For CallbackPromiseAdapter
     typedef WebServiceWorker WebType;
     static PassRefPtrWillBeRawPtr<ServiceWorker> take(ScriptPromiseResolver*, WebType* worker);
 
     static PassRefPtrWillBeRawPtr<ServiceWorker> from(ExecutionContext*, WebType*);
+
+    ~ServiceWorker() override;
     static void dispose(WebType*);
 
     void postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionState&);
     void terminate(ExceptionState&);
 
     String scriptURL() const;
     const AtomicString& state() const;
     DEFINE_ATTRIBUTE_EVENT_LISTENER(statechange);
 
     // WebServiceWorkerProxy overrides.
@@ skipping 17 matching lines @@
     static PassRefPtrWillBeRawPtr<ServiceWorker> getOrCreate(ExecutionContext*, WebType*);
     ServiceWorker(ExecutionContext*, PassOwnPtr<WebServiceWorker>);
     void setProxyState(ProxyState);
     void onPromiseResolved();
     void waitOnPromise(ScriptPromiseResolver*);
 
     // ActiveDOMObject overrides.
     virtual bool hasPendingActivity() const override;
     virtual void stop() override;
 
+    void dispose();
+
     OwnPtr<WebServiceWorker> m_outerWorker;
     ProxyState m_proxyState;
 };
 
 } // namespace blink
 
 #endif // ServiceWorker_h