Standardize usage of virtual/override/final specifiers.

ash/wm/video_detector.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_WM_VIDEO_DETECTOR_H_
 #define ASH_WM_VIDEO_DETECTOR_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
@@ skipping 40 matching lines @@
 
   // Number of video-sized updates that we must see within a second in a window
   // before we assume that a video is playing.
   static const int kMinFramesPerSecond;
 
   // Minimum amount of time between notifications to observers that a video is
   // playing.
   static const double kNotifyIntervalSec;
 
   VideoDetector();
-  virtual ~VideoDetector();
+  ~VideoDetector() override;
 
   void set_now_for_test(base::TimeTicks now) { now_for_test_ = now; }
 
   void AddObserver(VideoDetectorObserver* observer);
   void RemoveObserver(VideoDetectorObserver* observer);
 
   // EnvObserver overrides.
-  virtual void OnWindowInitialized(aura::Window* window) override;
+  void OnWindowInitialized(aura::Window* window) override;
 
   // WindowObserver overrides.
-  virtual void OnDelegatedFrameDamage(aura::Window* window,
-                                      const gfx::Rect& region) override;
-  virtual void OnWindowDestroyed(aura::Window* window) override;
+  void OnDelegatedFrameDamage(aura::Window* window,
+                              const gfx::Rect& region) override;
+  void OnWindowDestroyed(aura::Window* window) override;
 
   // ShellObserver overrides.
-  virtual void OnAppTerminating() override;
+  void OnAppTerminating() override;
 
  private:
   class WindowInfo;
   typedef std::map<aura::Window*, linked_ptr<WindowInfo> > WindowInfoMap;
 
   // Possibly notifies observers in response to detection of a video in
   // |window|.  Notifications are rate-limited and don't get sent if the window
   // is invisible or offscreen.
   void MaybeNotifyObservers(aura::Window* window, base::TimeTicks now);
 
@@ skipping 12 matching lines @@
   ScopedObserver<aura::Window, aura::WindowObserver> observer_manager_;
 
   bool is_shutting_down_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoDetector);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_VIDEO_DETECTOR_H_