Make WorkerScriptLoader back to RefCounted class

Source/core/workers/InProcessWorkerBase.h

Index: Source/core/workers/InProcessWorkerBase.h
diff --git a/Source/core/workers/InProcessWorkerBase.h b/Source/core/workers/InProcessWorkerBase.h
index 7ad95ee3881602321887aa39e4a0cc1cfa9eb50f..94818b629aa51aba4d8e692c3a822515c070ae09 100644
--- a/Source/core/workers/InProcessWorkerBase.h
+++ b/Source/core/workers/InProcessWorkerBase.h
@@ -56,7 +56,7 @@ private:
     void onResponse();
     void onFinished();
 
-    OwnPtr<WorkerScriptLoader> m_scriptLoader;
+    RefPtr<WorkerScriptLoader> m_scriptLoader;
     RefPtrWillBeMember<ContentSecurityPolicy> m_contentSecurityPolicy;
     WorkerGlobalScopeProxy* m_contextProxy; // The proxy outlives the worker to perform thread shutdown.
 };