Standardize usage of virtual/override/final specifiers.

ui/views/controls/scrollbar/kennedy_scroll_bar.h

Index: ui/views/controls/scrollbar/kennedy_scroll_bar.h
diff --git a/ui/views/controls/scrollbar/kennedy_scroll_bar.h b/ui/views/controls/scrollbar/kennedy_scroll_bar.h
index bd67a059751eff6d227e41996f1693021f646690..cb13732862f7dc4e485fe6e5a7485f3b005ead93 100644
--- a/ui/views/controls/scrollbar/kennedy_scroll_bar.h
+++ b/ui/views/controls/scrollbar/kennedy_scroll_bar.h
@@ -15,19 +15,19 @@ namespace views {
 class VIEWS_EXPORT KennedyScrollBar : public BaseScrollBar {
  public:
   explicit KennedyScrollBar(bool horizontal);
-  virtual ~KennedyScrollBar();
+  ~KennedyScrollBar() override;
 
  protected:
   // BaseScrollBar overrides:
-  virtual gfx::Rect GetTrackBounds() const override;
+  gfx::Rect GetTrackBounds() const override;
 
   // ScrollBar overrides:
-  virtual int GetLayoutSize() const override;
+  int GetLayoutSize() const override;
 
   // View overrides:
-  virtual gfx::Size GetPreferredSize() const override;
-  virtual void Layout() override;
-  virtual void OnPaint(gfx::Canvas* canvas) override;
+  gfx::Size GetPreferredSize() const override;
+  void Layout() override;
+  void OnPaint(gfx::Canvas* canvas) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(KennedyScrollBar);