Update {virtual,override,final} to follow C++11 style in ui.

ui/chromeos/network/network_icon_animation.h

Index: ui/chromeos/network/network_icon_animation.h
diff --git a/ui/chromeos/network/network_icon_animation.h b/ui/chromeos/network/network_icon_animation.h
index 8877f5d9c9f258bb8da97c62b9f1700def98fbdb..56ed2a2ed908392397bee4edd4000911271671fc 100644
--- a/ui/chromeos/network/network_icon_animation.h
+++ b/ui/chromeos/network/network_icon_animation.h
@@ -22,7 +22,7 @@ class AnimationObserver;
 class UI_CHROMEOS_EXPORT NetworkIconAnimation : public gfx::AnimationDelegate {
  public:
   NetworkIconAnimation();
-  virtual ~NetworkIconAnimation();
+  ~NetworkIconAnimation() override;
 
   // Returns the current animation value, [0-1].
   double GetAnimation();
@@ -33,7 +33,7 @@ class UI_CHROMEOS_EXPORT NetworkIconAnimation : public gfx::AnimationDelegate {
   void RemoveObserver(AnimationObserver* observer);
 
   // gfx::AnimationDelegate implementation.
-  virtual void AnimationProgressed(const gfx::Animation* animation) override;
+  void AnimationProgressed(const gfx::Animation* animation) override;
 
   static NetworkIconAnimation* GetInstance();