C++11 override style change for athena

athena/wm/overview_toolbar.cc

Index: athena/wm/overview_toolbar.cc
diff --git a/athena/wm/overview_toolbar.cc b/athena/wm/overview_toolbar.cc
index abd08487c1980cca1318c2a6d45910bc92463066..5942a5d53496b6987d5e70a546d98c1d17defe84 100644
--- a/athena/wm/overview_toolbar.cc
+++ b/athena/wm/overview_toolbar.cc
@@ -39,7 +39,7 @@ class ActionButton : public ui::LayerDelegate {
     layer_->SetOpacity(0);
   }
 
-  virtual ~ActionButton() {}
+  ~ActionButton() override {}
 
   static void DestroyAfterFadeout(scoped_ptr<ActionButton> button) {
     ui::Layer* layer = button->layer();
@@ -64,7 +64,7 @@ class ActionButton : public ui::LayerDelegate {
   }
 
   // ui::LayerDelegate:
-  virtual void OnPaintLayer(gfx::Canvas* canvas) override {
+  void OnPaintLayer(gfx::Canvas* canvas) override {
     ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
     canvas->DrawImageInt(*bundle.GetImageSkiaNamed(resource_id_), 0, 0);
     gfx::ShadowValues shadow;
@@ -82,11 +82,10 @@ class ActionButton : public ui::LayerDelegate {
                                       shadow);
   }
 
-  virtual void OnDelegatedFrameDamage(
-      const gfx::Rect& damage_rect_in_dip) override {}
+  void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override {}
 
-  virtual void OnDeviceScaleFactorChanged(float device_scale_factor) override {}
-  virtual base::Closure PrepareForLayerBoundsChange() override {
+  void OnDeviceScaleFactorChanged(float device_scale_factor) override {}
+  base::Closure PrepareForLayerBoundsChange() override {
     return base::Closure();
   }