Correctly track cross-thread pending FetchEvents.

third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.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 72 matching lines @@
 }
 
 ServiceWorkerGlobalScopeProxy::~ServiceWorkerGlobalScopeProxy() {
   // Verify that the proxy has been detached.
   DCHECK(!m_embeddedWorker);
 }
 
 DEFINE_TRACE(ServiceWorkerGlobalScopeProxy) {
   visitor->trace(m_document);
   visitor->trace(m_parentFrameTaskRunners);
-  visitor->trace(m_pendingPreloadFetchEvents);
 }
 
 void ServiceWorkerGlobalScopeProxy::setRegistration(
     std::unique_ptr<WebServiceWorkerRegistration::Handle> handle) {
   workerGlobalScope()->setRegistration(std::move(handle));
 }
 
 void ServiceWorkerGlobalScopeProxy::dispatchActivateEvent(int eventID) {
   WaitUntilObserver* observer = WaitUntilObserver::create(
       workerGlobalScope(), WaitUntilObserver::Activate, eventID);
@@ skipping 380 matching lines @@
   return *m_document;
 }
 
 ServiceWorkerGlobalScope* ServiceWorkerGlobalScopeProxy::workerGlobalScope()
     const {
   DCHECK(m_workerGlobalScope);
   return m_workerGlobalScope;
 }
 
 }  // namespace blink