Standardize usage of virtual/override/final specifiers.

ui/views/round_rect_painter.h

Index: ui/views/round_rect_painter.h
diff --git a/ui/views/round_rect_painter.h b/ui/views/round_rect_painter.h
index e498e8cbd46ed064f21bdd4932d08ba8917016e8..9b1da6d8bb450c5ba763ff236083a267ba3c4d0b 100644
--- a/ui/views/round_rect_painter.h
+++ b/ui/views/round_rect_painter.h
@@ -21,11 +21,11 @@ namespace views {
 class VIEWS_EXPORT RoundRectPainter : public Painter {
  public:
   RoundRectPainter(SkColor border_color, int corner_radius);
-  virtual ~RoundRectPainter();
+  ~RoundRectPainter() override;
 
   // Painter:
-  virtual gfx::Size GetMinimumSize() const override;
-  virtual void Paint(gfx::Canvas* canvas, const gfx::Size& size) override;
+  gfx::Size GetMinimumSize() const override;
+  void Paint(gfx::Canvas* canvas, const gfx::Size& size) override;
 
  private:
   const SkColor border_color_;