Standardize usage of virtual/override/final specifiers.

ash/shell/window_watcher.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_SHELL_WINDOW_WATCHER_H_
 #define ASH_SHELL_WINDOW_WATCHER_H_
 
 #include <map>
 
 #include "ash/shelf/shelf_item_types.h"
@@ skipping 11 matching lines @@
 namespace shell {
 
 // TODO(sky): fix this class, its a bit broke with workspace2.
 
 // WindowWatcher is responsible for listening for newly created windows and
 // creating items on the Shelf for them.
 class WindowWatcher : public aura::WindowObserver,
                       public gfx::DisplayObserver {
  public:
   WindowWatcher();
-  virtual ~WindowWatcher();
+  ~WindowWatcher() override;
 
   aura::Window* GetWindowByID(ash::ShelfID id);
 
   // aura::WindowObserver overrides:
-  virtual void OnWindowAdded(aura::Window* new_window) override;
-  virtual void OnWillRemoveWindow(aura::Window* window) override;
+  void OnWindowAdded(aura::Window* new_window) override;
+  void OnWillRemoveWindow(aura::Window* window) override;
 
   // gfx::DisplayObserver overrides:
-  virtual void OnDisplayAdded(const gfx::Display& new_display) override;
-  virtual void OnDisplayRemoved(const gfx::Display& old_display) override;
-  virtual void OnDisplayMetricsChanged(const gfx::Display& display,
-                                       uint32_t metrics) override;
+  void OnDisplayAdded(const gfx::Display& new_display) override;
+  void OnDisplayRemoved(const gfx::Display& old_display) override;
+  void OnDisplayMetricsChanged(const gfx::Display& display,
+                               uint32_t metrics) override;
 
  private:
   class WorkspaceWindowWatcher;
 
   typedef std::map<ash::ShelfID, aura::Window*> IDToWindow;
 
   // Maps from window to the id we gave it.
   IDToWindow id_to_window_;
 
   scoped_ptr<WorkspaceWindowWatcher> workspace_window_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowWatcher);
 };
 
 }  // namespace shell
 }  // namespace ash
 
 #endif  // ASH_SHELL_WINDOW_WATCHER_H_