Update worker classes to use OVERRIDE / FINAL when needed

Source/core/workers/WorkerNavigator.h

Index: Source/core/workers/WorkerNavigator.h
diff --git a/Source/core/workers/WorkerNavigator.h b/Source/core/workers/WorkerNavigator.h
index 61c06183fadf4f0a7fd4e6e7cd933c0eed6c9adf..850d706ba9b9bb6c03f858f37f9998bfc265245a 100644
--- a/Source/core/workers/WorkerNavigator.h
+++ b/Source/core/workers/WorkerNavigator.h
@@ -35,7 +35,7 @@
 
 namespace WebCore {
 
-class WorkerNavigator : public RefCounted<WorkerNavigator>, public ScriptWrappable, public NavigatorBase, public Supplementable<WorkerNavigator> {
+class WorkerNavigator FINAL : public RefCounted<WorkerNavigator>, public ScriptWrappable, public NavigatorBase, public Supplementable<WorkerNavigator> {
 public:
     static PassRefPtr<WorkerNavigator> create(const String& userAgent) { return adoptRef(new WorkerNavigator(userAgent)); }
     virtual ~WorkerNavigator();