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

ash/display/display_configurator_animation.cc

Index: ash/display/display_configurator_animation.cc
diff --git a/ash/display/display_configurator_animation.cc b/ash/display/display_configurator_animation.cc
index a376568e783e2904e6870e02cb86f775e5f3aff5..105c1edca51b6d05d43c643d238e684645bd388f 100644
--- a/ash/display/display_configurator_animation.cc
+++ b/ash/display/display_configurator_animation.cc
@@ -63,20 +63,18 @@ class CallbackRunningObserver {
 
    protected:
     // ui::LayerAnimationObserver overrides:
-    virtual void OnLayerAnimationEnded(
-        ui::LayerAnimationSequence* sequence) override {
+    void OnLayerAnimationEnded(ui::LayerAnimationSequence* sequence) override {
       animator_->RemoveObserver(this);
       observer_->OnSingleTaskCompleted();
     }
-    virtual void OnLayerAnimationAborted(
+    void OnLayerAnimationAborted(
         ui::LayerAnimationSequence* sequence) override {
       animator_->RemoveObserver(this);
       observer_->OnSingleTaskAborted();
     }
-    virtual void OnLayerAnimationScheduled(
-        ui::LayerAnimationSequence* sequence) override {
-    }
-    virtual bool RequiresNotificationWhenAnimatorDestroyed() const override {
+    void OnLayerAnimationScheduled(
+        ui::LayerAnimationSequence* sequence) override {}
+    bool RequiresNotificationWhenAnimatorDestroyed() const override {
       return true;
     }