Oilpan: fix WorkerThreadStartupData finalization handling.

Source/core/workers/WorkerThread.h

Index: Source/core/workers/WorkerThread.h
diff --git a/Source/core/workers/WorkerThread.h b/Source/core/workers/WorkerThread.h
index 1ac816457ec1767d3193d861ff84a469016d24ca..4a66960a7817ce0179f3d486e3edebeab2ac84a6 100644
--- a/Source/core/workers/WorkerThread.h
+++ b/Source/core/workers/WorkerThread.h
@@ -110,10 +110,10 @@ public:
     void setWorkerInspectorController(WorkerInspectorController*);
 
 protected:
-    WorkerThread(PassRefPtr<WorkerLoaderProxy>, WorkerReportingProxy&, PassOwnPtrWillBeRawPtr<WorkerThreadStartupData>);
+    WorkerThread(PassRefPtr<WorkerLoaderProxy>, WorkerReportingProxy&, PassOwnPtr<WorkerThreadStartupData>);
 
     // Factory method for creating a new worker context for the thread.
-    virtual PassRefPtrWillBeRawPtr<WorkerGlobalScope> createWorkerGlobalScope(PassOwnPtrWillBeRawPtr<WorkerThreadStartupData>) = 0;
+    virtual PassRefPtrWillBeRawPtr<WorkerGlobalScope> createWorkerGlobalScope(PassOwnPtr<WorkerThreadStartupData>) = 0;
 
     virtual void postInitialize() { }
 
@@ -147,7 +147,7 @@ private:
 
     Mutex m_threadCreationMutex;
     RefPtrWillBePersistent<WorkerGlobalScope> m_workerGlobalScope;
-    OwnPtrWillBePersistent<WorkerThreadStartupData> m_startupData;
+    OwnPtr<WorkerThreadStartupData> m_startupData;
 
     v8::Isolate* m_isolate;
     OwnPtr<V8IsolateInterruptor> m_interruptor;