Standardize usage of virtual/override/final specifiers.

ash/shelf/shelf_window_watcher_item_delegate.h

Index: ash/shelf/shelf_window_watcher_item_delegate.h
diff --git a/ash/shelf/shelf_window_watcher_item_delegate.h b/ash/shelf/shelf_window_watcher_item_delegate.h
index b39a70b23db8b6b17f086b0a6e751458e34d19e7..d2733d3eff45a417f43c30f5351f858301c3fe89 100644
--- a/ash/shelf/shelf_window_watcher_item_delegate.h
+++ b/ash/shelf/shelf_window_watcher_item_delegate.h
@@ -21,17 +21,17 @@ class ShelfWindowWatcherItemDelegate : public ShelfItemDelegate {
  public:
   ShelfWindowWatcherItemDelegate(aura::Window* window, ShelfModel* model_);
 
-  virtual ~ShelfWindowWatcherItemDelegate();
+  ~ShelfWindowWatcherItemDelegate() override;
 
  private:
   // ShelfItemDelegate overrides:
-  virtual bool ItemSelected(const ui::Event& event) override;
-  virtual base::string16 GetTitle() override;
-  virtual ui::MenuModel* CreateContextMenu(aura::Window* root_window) override;
-  virtual ShelfMenuModel* CreateApplicationMenu(int event_flags) override;
-  virtual bool IsDraggable() override;
-  virtual bool ShouldShowTooltip() override;
-  virtual void Close() override;
+  bool ItemSelected(const ui::Event& event) override;
+  base::string16 GetTitle() override;
+  ui::MenuModel* CreateContextMenu(aura::Window* root_window) override;
+  ShelfMenuModel* CreateApplicationMenu(int event_flags) override;
+  bool IsDraggable() override;
+  bool ShouldShowTooltip() override;
+  void Close() override;
 
   // Stores a Window associated with this item. Not owned.
   aura::Window* window_;