Update worker classes to use OVERRIDE / FINAL when needed

Source/core/workers/WorkerScriptLoader.h

Index: Source/core/workers/WorkerScriptLoader.h
diff --git a/Source/core/workers/WorkerScriptLoader.h b/Source/core/workers/WorkerScriptLoader.h
index e4038516948a9684b3d118a275a7331a212f6631..8e64a097a2baa6cbfddcc562925ec1fc18c47018 100644
--- a/Source/core/workers/WorkerScriptLoader.h
+++ b/Source/core/workers/WorkerScriptLoader.h
@@ -45,7 +45,7 @@ namespace WebCore {
     class TextResourceDecoder;
     class WorkerScriptLoaderClient;
 
-    class WorkerScriptLoader : public RefCounted<WorkerScriptLoader>, public ThreadableLoaderClient {
+    class WorkerScriptLoader FINAL : public RefCounted<WorkerScriptLoader>, public ThreadableLoaderClient {
         WTF_MAKE_FAST_ALLOCATED;
     public:
         static PassRefPtr<WorkerScriptLoader> create()
@@ -82,7 +82,7 @@ namespace WebCore {
         friend class WTF::RefCounted<WorkerScriptLoader>;
 
         WorkerScriptLoader();
-        ~WorkerScriptLoader();
+        virtual ~WorkerScriptLoader();
 
         PassOwnPtr<ResourceRequest> createResourceRequest();
         void notifyFinished();