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

Source/core/workers/WorkerThread.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 47 matching lines @@
 
 } // namespace
 
 class WorkerMicrotaskRunner : public WebThread::TaskObserver {
 public:
     explicit WorkerMicrotaskRunner(WorkerThread* workerThread)
         : m_workerThread(workerThread)
     {
     }
 
-    virtual void willProcessTask() override
+    void willProcessTask() override
     {
         // No tasks should get executed after we have closed.
         WorkerGlobalScope* globalScope = m_workerThread->workerGlobalScope();
         ASSERT_UNUSED(globalScope, !globalScope || !globalScope->isClosing());
     }
 
-    virtual void didProcessTask() override
+    void didProcessTask() override
     {
         Microtask::performCheckpoint(m_workerThread->isolate());
         if (WorkerGlobalScope* globalScope = m_workerThread->workerGlobalScope()) {
             if (WorkerScriptController* scriptController = globalScope->script())
                 scriptController->rejectedPromises()->processQueue();
             if (globalScope->isClosing()) {
                 m_workerThread->workerReportingProxy().workerGlobalScopeClosed();
                 m_workerThread->shutdown();
             }
         }
@@ skipping 24 matching lines @@
 }
 
 class WorkerThreadTask : public WebThread::Task {
     WTF_MAKE_NONCOPYABLE(WorkerThreadTask); WTF_MAKE_FAST_ALLOCATED(WorkerThreadTask);
 public:
     static PassOwnPtr<WorkerThreadTask> create(WorkerThread& workerThread, PassOwnPtr<ExecutionContextTask> task, bool isInstrumented)
     {
         return adoptPtr(new WorkerThreadTask(workerThread, task, isInstrumented));
     }
 
-    virtual ~WorkerThreadTask() { }
+    ~WorkerThreadTask() override { }
 
-    virtual void run() override
+    void run() override
     {
         WorkerGlobalScope* workerGlobalScope = m_workerThread.workerGlobalScope();
         // If the thread is terminated before it had a chance initialize (see
         // WorkerThread::Initialize()), we mustn't run any of the posted tasks.
         if (!workerGlobalScope) {
             ASSERT(m_workerThread.terminated());
             return;
         }
 
         if (m_isInstrumented)
@@ skipping 356 matching lines @@
     InspectorInstrumentation::didLeaveNestedRunLoop(m_workerGlobalScope.get());
 }
 
 void WorkerThread::setWorkerInspectorController(WorkerInspectorController* workerInspectorController)
 {
     MutexLocker locker(m_workerInspectorControllerMutex);
     m_workerInspectorController = workerInspectorController;
 }
 
 } // namespace blink