Update AbstractWorker, Worker and SharedWorker to match the spec

Source/core/workers/AbstractWorker.h

Index: Source/core/workers/AbstractWorker.h
diff --git a/Source/core/workers/AbstractWorker.h b/Source/core/workers/AbstractWorker.h
index e73baf2cd4542abe8079f1799dca210cb94fbbee..13bb92926400cf604c4064a3438eab11c65155c0 100644
--- a/Source/core/workers/AbstractWorker.h
+++ b/Source/core/workers/AbstractWorker.h
@@ -46,7 +46,7 @@ namespace WebCore {
     class KURL;
     class ScriptExecutionContext;
 
-    class AbstractWorker : public RefCounted<AbstractWorker>, public ScriptWrappable, public ActiveDOMObject, public EventTarget {
+    class AbstractWorker : public RefCounted<AbstractWorker>, public EventTarget, public ActiveDOMObject {
     public:
         // EventTarget APIs
         virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE { return ActiveDOMObject::scriptExecutionContext(); }