Oilpan: move core/workers to oilpan's heap.

Source/web/WebEmbeddedWorkerImpl.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 63 matching lines @@
     WebEmbeddedWorkerStartData m_workerStartData;
 
     // These are kept until startWorkerContext is called, and then passed on
     // to WorkerContext.
     OwnPtr<WebServiceWorkerContextClient> m_workerContextClient;
     OwnPtr<WebWorkerPermissionClientProxy> m_permissionClient;
 
     // Kept around only while main script loading is ongoing.
     OwnPtr<Loader> m_mainScriptLoader;
 
-    RefPtr<WebCore::WorkerThread> m_workerThread;
+    RefPtrWillBePersistent<WebCore::WorkerThread> m_workerThread;
     OwnPtr<LoaderProxy> m_loaderProxy;
     OwnPtr<ServiceWorkerGlobalScopeProxy> m_workerGlobalScopeProxy;
 
     // 'shadow page' - created to proxy loading requests from the worker.
     // Both WebView and WebFrame objects are close()'ed (where they're
     // deref'ed) when this EmbeddedWorkerImpl is destructed, therefore they
     // are guaranteed to exist while this object is around.
     WebView* m_webView;
     WebFrame* m_mainFrame;
 
     bool m_askedToTerminate;
 };
 
 } // namespace blink
 
 #endif // WebEmbeddedWorkerImpl_h