Fix virtual/override/final usage in the rest of Source/core/.

Source/core/workers/SharedWorkerThread.h

Index: Source/core/workers/SharedWorkerThread.h
diff --git a/Source/core/workers/SharedWorkerThread.h b/Source/core/workers/SharedWorkerThread.h
index 4864a0c805f562e04ef148b010570760cf7c17d8..9b52287459452f877626bd775c27bc34fe7547d5 100644
--- a/Source/core/workers/SharedWorkerThread.h
+++ b/Source/core/workers/SharedWorkerThread.h
@@ -41,7 +41,7 @@ class WorkerThreadStartupData;
 class CORE_EXPORT SharedWorkerThread : public WorkerThread {
 public:
     static PassRefPtr<SharedWorkerThread> create(const String& name, PassRefPtr<WorkerLoaderProxy>, WorkerReportingProxy&);
-    virtual ~SharedWorkerThread();
+    ~SharedWorkerThread() override;
 
 protected:
     PassRefPtrWillBeRawPtr<WorkerGlobalScope> createWorkerGlobalScope(PassOwnPtr<WorkerThreadStartupData>) override;