ServiceWorker: Bypass resolving a promise when ExecutionContext is gone

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 39 matching lines @@
     : public AbstractWorker
     , public blink::WebServiceWorkerProxy {
 public:
     virtual ~ServiceWorker() { }
 
     // For CallbackPromiseAdapter
     typedef blink::WebServiceWorker WebType;
     static PassRefPtrWillBeRawPtr<ServiceWorker> from(ScriptPromiseResolver*, WebType* worker);
 
     static PassRefPtrWillBeRawPtr<ServiceWorker> from(ExecutionContext*, WebType*);
+    static void dispose(WebType*);
 
     void postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionState&);
 
     String scope() const;
     String url() const;
     const AtomicString& state() const;
     DEFINE_ATTRIBUTE_EVENT_LISTENER(statechange);
 
     // WebServiceWorkerProxy overrides.
     virtual bool isReady() OVERRIDE;
@@ skipping 22 matching lines @@
     virtual bool hasPendingActivity() const OVERRIDE;
     virtual void stop() OVERRIDE;
 
     OwnPtr<blink::WebServiceWorker> m_outerWorker;
     ProxyState m_proxyState;
 };
 
 } // namespace blink
 
 #endif // ServiceWorker_h