Update remaining HTML classes to use OVERRIDE / FINAL when needed

Source/core/html/shadow/SpinButtonElement.h

Index: Source/core/html/shadow/SpinButtonElement.h
diff --git a/Source/core/html/shadow/SpinButtonElement.h b/Source/core/html/shadow/SpinButtonElement.h
index 41de8fcdaeee2f8ae3e3340bc437c30f9a8f9424..8c3da22f80948b513f6812ddfe125be08c9e78c1 100644
--- a/Source/core/html/shadow/SpinButtonElement.h
+++ b/Source/core/html/shadow/SpinButtonElement.h
@@ -56,7 +56,7 @@ public:
     // implementation, e.g. during event handling.
     static PassRefPtr<SpinButtonElement> create(Document&, SpinButtonOwner&);
     UpDownState upDownState() const { return m_upDownState; }
-    virtual void releaseCapture();
+    void releaseCapture();
     void removeSpinButtonOwner() { m_spinButtonOwner = 0; }
 
     void step(int amount);
@@ -70,19 +70,19 @@ private:
     SpinButtonElement(Document&, SpinButtonOwner&);
 
     virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
-    virtual bool isSpinButtonElement() const { return true; }
+    virtual bool isSpinButtonElement() const OVERRIDE { return true; }
     virtual bool isDisabledFormControl() const OVERRIDE { return shadowHost() && shadowHost()->isDisabledFormControl(); }
     virtual bool matchesReadOnlyPseudoClass() const OVERRIDE;
     virtual bool matchesReadWritePseudoClass() const OVERRIDE;
-    virtual void defaultEventHandler(Event*);
+    virtual void defaultEventHandler(Event*) OVERRIDE;
     virtual void willOpenPopup() OVERRIDE;
     void doStepAction(int);
     void startRepeatingTimer();
     void stopRepeatingTimer();
     void repeatingTimerFired(Timer<SpinButtonElement>*);
-    virtual void setHovered(bool = true);
+    virtual void setHovered(bool = true) OVERRIDE;
     bool shouldRespondToMouseEvents();
-    virtual bool isMouseFocusable() const { return false; }
+    virtual bool isMouseFocusable() const OVERRIDE { return false; }
 
     SpinButtonOwner* m_spinButtonOwner;
     bool m_capturing;