Update accessibility classes to use OVERRIDE / FINAL when needed

Source/core/accessibility/AXRenderObject.h

Index: Source/core/accessibility/AXRenderObject.h
diff --git a/Source/core/accessibility/AXRenderObject.h b/Source/core/accessibility/AXRenderObject.h
index 160d0d7db3aa34da2e86e70d81318c6d28d42964..1ffe7c3685fc8cb946d1f33a5e4f57bee9f62eeb 100644
--- a/Source/core/accessibility/AXRenderObject.h
+++ b/Source/core/accessibility/AXRenderObject.h
@@ -64,7 +64,7 @@ public:
     virtual ~AXRenderObject();
 
     // Public, overridden from AXObject.
-    virtual RenderObject* renderer() const OVERRIDE { return m_renderer; }
+    virtual RenderObject* renderer() const OVERRIDE FINAL { return m_renderer; }
     virtual LayoutRect elementRect() const OVERRIDE;
 
     void setRenderer(RenderObject*);
@@ -73,7 +73,7 @@ public:
     Document* topDocument() const;
     bool shouldNotifyActiveDescendant() const;
     bool needsToUpdateChildren() const { return m_childrenDirty; }
-    ScrollableArea* getScrollableAreaIfScrollable() const;
+    virtual ScrollableArea* getScrollableAreaIfScrollable() const OVERRIDE FINAL;
     virtual AccessibilityRole determineAccessibilityRole() OVERRIDE;
     void checkCachedElementRect() const;
     void updateCachedElementRect() const;