Standardize usage of virtual/override/final specifiers.

ui/views/examples/menu_example.cc

Index: ui/views/examples/menu_example.cc
diff --git a/ui/views/examples/menu_example.cc b/ui/views/examples/menu_example.cc
index 1b95457c6705d6fd67abae971ba4883e67fc2dc7..551de1b6c9ada60824eb57d689287bd5e8493d60 100644
--- a/ui/views/examples/menu_example.cc
+++ b/ui/views/examples/menu_example.cc
@@ -28,12 +28,11 @@ class ExampleMenuModel : public ui::SimpleMenuModel,
   ExampleMenuModel();
 
   // ui::SimpleMenuModel::Delegate:
-  virtual bool IsCommandIdChecked(int command_id) const override;
-  virtual bool IsCommandIdEnabled(int command_id) const override;
-  virtual bool GetAcceleratorForCommandId(
-      int command_id,
-      ui::Accelerator* accelerator) override;
-  virtual void ExecuteCommand(int command_id, int event_flags) override;
+  bool IsCommandIdChecked(int command_id) const override;
+  bool IsCommandIdEnabled(int command_id) const override;
+  bool GetAcceleratorForCommandId(int command_id,
+                                  ui::Accelerator* accelerator) override;
+  void ExecuteCommand(int command_id, int event_flags) override;
 
  private:
   enum GroupID {
@@ -61,12 +60,11 @@ class ExampleMenuModel : public ui::SimpleMenuModel,
 class ExampleMenuButton : public MenuButton, public MenuButtonListener {
  public:
   explicit ExampleMenuButton(const base::string16& test);
-  virtual ~ExampleMenuButton();
+  ~ExampleMenuButton() override;
 
  private:
   // MenuButtonListener:
-  virtual void OnMenuButtonClicked(View* source,
-                                   const gfx::Point& point) override;
+  void OnMenuButtonClicked(View* source, const gfx::Point& point) override;
 
   ui::SimpleMenuModel* GetMenuModel();