Standardize usage of virtual/override/final specifiers.

ash/test/test_shelf_item_delegate.h

Index: ash/test/test_shelf_item_delegate.h
diff --git a/ash/test/test_shelf_item_delegate.h b/ash/test/test_shelf_item_delegate.h
index 71f25d556e2ffbcda931b81543027b5cf1e9f835..836f5f1b9ef2ae1538f28eb07d4c07e0a3236807 100644
--- a/ash/test/test_shelf_item_delegate.h
+++ b/ash/test/test_shelf_item_delegate.h
@@ -20,16 +20,16 @@ namespace test {
 class TestShelfItemDelegate : public ShelfItemDelegate {
  public:
   explicit TestShelfItemDelegate(aura::Window* window);
-  virtual ~TestShelfItemDelegate();
+  ~TestShelfItemDelegate() override;
 
   // ShelfItemDelegate:
-  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;
 
  private:
   aura::Window* window_;