Standardize usage of virtual/override/final specifiers.

ui/views/examples/scroll_view_example.h

Index: ui/views/examples/scroll_view_example.h
diff --git a/ui/views/examples/scroll_view_example.h b/ui/views/examples/scroll_view_example.h
index b3fd3bf599252f3e246df17d0ab2100650d30a95..ce2111032e4145f3c7650eb4c93e72b3c9cf97ee 100644
--- a/ui/views/examples/scroll_view_example.h
+++ b/ui/views/examples/scroll_view_example.h
@@ -22,14 +22,14 @@ class VIEWS_EXAMPLES_EXPORT ScrollViewExample : public ExampleBase,
                                                 public ButtonListener {
  public:
   ScrollViewExample();
-  virtual ~ScrollViewExample();
+  ~ScrollViewExample() override;
 
   // ExampleBase:
-  virtual void CreateExampleView(View* container) override;
+  void CreateExampleView(View* container) override;
 
  private:
   // ButtonListener:
-  virtual void ButtonPressed(Button* sender, const ui::Event& event) override;
+  void ButtonPressed(Button* sender, const ui::Event& event) override;
 
   // Control buttons to change the size of scrollable and jump to
   // predefined position.