Standardize usage of virtual/override/final specifiers.

ui/views/examples/tabbed_pane_example.h

Index: ui/views/examples/tabbed_pane_example.h
diff --git a/ui/views/examples/tabbed_pane_example.h b/ui/views/examples/tabbed_pane_example.h
index a211a759d9e94fb114b672ad3f3939d513c7b1de..79a1f42ff79f0cddd7cade63c717f377ffb4d308 100644
--- a/ui/views/examples/tabbed_pane_example.h
+++ b/ui/views/examples/tabbed_pane_example.h
@@ -23,17 +23,17 @@ class VIEWS_EXAMPLES_EXPORT TabbedPaneExample : public ExampleBase,
                                                 public TabbedPaneListener {
  public:
   TabbedPaneExample();
-  virtual ~TabbedPaneExample();
+  ~TabbedPaneExample() 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;
 
   // TabbedPaneListener:
-  virtual void TabSelectedAt(int index) override;
+  void TabSelectedAt(int index) override;
 
   // Print the status of the tab in the status area.
   void PrintStatus();