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

Source/core/timing/PerformanceResourceTiming.h

Index: Source/core/timing/PerformanceResourceTiming.h
diff --git a/Source/core/timing/PerformanceResourceTiming.h b/Source/core/timing/PerformanceResourceTiming.h
index 66efd50d08de05ee98077e3d676d0c9fedf40d8c..3a23c2ecc5b1b422366a156f79679961ba4f1cdf 100644
--- a/Source/core/timing/PerformanceResourceTiming.h
+++ b/Source/core/timing/PerformanceResourceTiming.h
@@ -69,11 +69,11 @@ public:
     double responseStart() const;
     double responseEnd() const;
 
-    virtual bool isResource() override { return true; }
+    bool isResource() override { return true; }
 
 private:
     PerformanceResourceTiming(const ResourceTimingInfo&, double timeOrigin, double startTime, double lastRedirectEndTime, bool m_allowTimingDetails, bool m_allowRedirectDetails);
-    virtual ~PerformanceResourceTiming();
+    ~PerformanceResourceTiming() override;
 
     double workerReady() const;