Update accessibility classes to use OVERRIDE / FINAL when needed

Source/core/accessibility/AXScrollView.h

Index: Source/core/accessibility/AXScrollView.h
diff --git a/Source/core/accessibility/AXScrollView.h b/Source/core/accessibility/AXScrollView.h
index cf7e291024e41d7d34f14fba1cf068b327e37625..5da75f3afc0c38db280b872f8f5155d22630764f 100644
--- a/Source/core/accessibility/AXScrollView.h
+++ b/Source/core/accessibility/AXScrollView.h
@@ -34,10 +34,10 @@ class AXScrollbar;
 class Scrollbar;
 class ScrollView;
 
-class AXScrollView : public AXObject {
+class AXScrollView FINAL : public AXObject {
 public:
     static PassRefPtr<AXScrollView> create(ScrollView*);
-    virtual AccessibilityRole roleValue() const { return ScrollAreaRole; }
+    virtual AccessibilityRole roleValue() const OVERRIDE { return ScrollAreaRole; }
     ScrollView* scrollView() const { return m_scrollView; }
 
     virtual ~AXScrollView();