Fix virtual/override/final usage in Source/core/svg/.

Source/core/svg/animation/SVGSMILElement.cpp

Index: Source/core/svg/animation/SVGSMILElement.cpp
diff --git a/Source/core/svg/animation/SVGSMILElement.cpp b/Source/core/svg/animation/SVGSMILElement.cpp
index 7d4632fb9b15313d5ea34e2f0b0c392d43fdb09a..932e42dcc180d5ae20024f1f577c5b0dd4d40f13 100644
--- a/Source/core/svg/animation/SVGSMILElement.cpp
+++ b/Source/core/svg/animation/SVGSMILElement.cpp
@@ -52,7 +52,7 @@ public:
         return adoptRefWillBeNoop(new RepeatEvent(type, false, false, repeat));
     }
 
-    virtual ~RepeatEvent() { }
+    ~RepeatEvent() override {}
 
     int repeat() const { return m_repeat; }
 
@@ -119,7 +119,7 @@ public:
             : nullptr;
     }
 
-    virtual bool operator==(const EventListener& other) override;
+    bool operator==(const EventListener& other) override;
 
     void disconnectAnimation()
     {
@@ -134,7 +134,7 @@ private:
     {
     }
 
-    virtual void handleEvent(ExecutionContext*, Event*) override;
+    void handleEvent(ExecutionContext*, Event*) override;
 
     SVGSMILElement* m_animation;
     SVGSMILElement::Condition* m_condition;