Update remaining HTML classes to use OVERRIDE / FINAL when needed

Source/core/html/shadow/SliderThumbElement.h

Index: Source/core/html/shadow/SliderThumbElement.h
diff --git a/Source/core/html/shadow/SliderThumbElement.h b/Source/core/html/shadow/SliderThumbElement.h
index c1d85a68c7be5701e76f307a3138e876d460fb01..39bbe015d46605ea430f2967cb21f9620d88fedd 100644
--- a/Source/core/html/shadow/SliderThumbElement.h
+++ b/Source/core/html/shadow/SliderThumbElement.h
@@ -51,7 +51,7 @@ public:
     void setPositionFromValue();
 
     void dragFrom(const LayoutPoint&);
-    virtual void defaultEventHandler(Event*);
+    virtual void defaultEventHandler(Event*) OVERRIDE;
     virtual bool willRespondToMouseMoveEvents() OVERRIDE;
     virtual bool willRespondToMouseClickEvents() OVERRIDE;
     virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
@@ -62,12 +62,12 @@ public:
 
 private:
     SliderThumbElement(Document&);
-    virtual RenderObject* createRenderer(RenderStyle*);
-    virtual PassRefPtr<Element> cloneElementWithoutAttributesAndChildren();
+    virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
+    virtual PassRefPtr<Element> cloneElementWithoutAttributesAndChildren() OVERRIDE;
     virtual bool isDisabledFormControl() const OVERRIDE;
     virtual bool matchesReadOnlyPseudoClass() const OVERRIDE;
     virtual bool matchesReadWritePseudoClass() const OVERRIDE;
-    virtual Node* focusDelegate();
+    virtual Node* focusDelegate() OVERRIDE;
     void startDragging();
 
     bool m_inDragMode;
@@ -89,7 +89,7 @@ public:
     void updateAppearance(RenderStyle* parentStyle);
 
 private:
-    virtual bool isSliderThumb() const;
+    virtual bool isSliderThumb() const OVERRIDE;
     virtual bool supportsPartialLayout() const OVERRIDE { return false; }
 };
 
@@ -101,8 +101,8 @@ public:
 
 private:
     SliderContainerElement(Document&);
-    virtual RenderObject* createRenderer(RenderStyle*);
-    virtual const AtomicString& shadowPseudoId() const;
+    virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
+    virtual const AtomicString& shadowPseudoId() const OVERRIDE;
 };
 
 }