ServiceWorker: Bypass resolving a promise when ExecutionContext is gone

Source/modules/serviceworkers/ServiceWorkerContainer.cpp

 /*
  * 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 104 matching lines @@
 }
 
 class UndefinedValue {
 public:
     typedef WebServiceWorker WebType;
     static V8UndefinedType from(ScriptPromiseResolver* resolver, WebServiceWorker* worker)
     {
         ASSERT(!worker); // Anything passed here will be leaked.
         return V8UndefinedType();
     }
+    static void dispose(WebServiceWorker* worker)
+    {
+        ASSERT(!worker); // Anything passed here will be leaked.
+    }
 
 private:
     UndefinedValue();
 };
 
 ScriptPromise ServiceWorkerContainer::unregisterServiceWorker(ScriptState* scriptState, const String& pattern)
 {
     ASSERT(RuntimeEnabledFeatures::serviceWorkerEnabled());
     RefPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
@@ skipping 120 matching lines @@
     m_ready = createReadyProperty();
 
     if (ServiceWorkerContainerClient* client = ServiceWorkerContainerClient::from(executionContext)) {
         m_provider = client->provider();
         if (m_provider)
             m_provider->setClient(this);
     }
 }
 
 } // namespace WebCore