Standardize usage of virtual/override/final specifiers.

ash/wm/mru_window_tracker.h

 // Copyright 2013 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_WM_MRU_WINDOW_TRACKER_H_
 #define ASH_WM_MRU_WINDOW_TRACKER_H_
 
 #include <list>
 #include <vector>
 
@@ skipping 16 matching lines @@
 // Maintains a most recently used list of windows. This is used for window
 // cycling using Alt+Tab and overview mode.
 class ASH_EXPORT MruWindowTracker
     : public aura::client::ActivationChangeObserver,
       public aura::WindowObserver {
  public:
   typedef std::vector<aura::Window*> WindowList;
 
   explicit MruWindowTracker(
       aura::client::ActivationClient* activation_client);
-  virtual ~MruWindowTracker();
+  ~MruWindowTracker() override;
 
   // Returns the set of windows which can be cycled through. This method creates
   // the vector based on the current set of windows across all valid root
   // windows. As a result it is not necessarily the same as the set of
   // windows being iterated over.
   // If |top_most_at_end| the window list will return in ascending (lowest
   // window in stacking order first) order instead of the default descending
   // (top most window first) order.
   static WindowList BuildWindowList(bool top_most_at_end);
 
   // Returns the set of windows which can be cycled through using the tracked
   // list of most recently used windows.
   WindowList BuildMruWindowList();
 
   // Starts or stops ignoring window activations. If no longer ignoring
   // activations the currently active window is moved to the front of the
   // MRU window list. Used by WindowCycleList to avoid adding all cycled
   // windows to the front of the MRU window list.
   void SetIgnoreActivations(bool ignore);
 
  private:
   // Updates the mru_windows_ list to insert/move |active_window| at/to the
   // front.
   void SetActiveWindow(aura::Window* active_window);
 
   // Overridden from aura::client::ActivationChangeObserver:
-  virtual void OnWindowActivated(aura::Window* gained_active,
-                                 aura::Window* lost_active) override;
+  void OnWindowActivated(aura::Window* gained_active,
+                         aura::Window* lost_active) override;
 
   // Overridden from WindowObserver:
-  virtual void OnWindowDestroyed(aura::Window* window) override;
+  void OnWindowDestroyed(aura::Window* window) override;
 
   // List of windows that have been activated in containers that we cycle
   // through, sorted by most recently used.
   std::list<aura::Window*> mru_windows_;
 
   aura::client::ActivationClient* activation_client_;
 
   bool ignore_window_activations_;
 
   DISALLOW_COPY_AND_ASSIGN(MruWindowTracker);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_MRU_WINDOW_TRACKER_H_