C++11 override style change for athena

athena/wm/bezel_controller.h

Index: athena/wm/bezel_controller.h
diff --git a/athena/wm/bezel_controller.h b/athena/wm/bezel_controller.h
index 41cd76c8c915ee341d0f6e665eedd1caf487a60e..007c9cd62267e9d29c453aba68daf0d7db5b5992 100644
--- a/athena/wm/bezel_controller.h
+++ b/athena/wm/bezel_controller.h
@@ -32,7 +32,7 @@ class BezelController : public ui::EventHandler {
   // the left and right bezel.
   class ScrollDelegate {
    public:
-    virtual ~ScrollDelegate() {}
+    ~ScrollDelegate() {}
 
     // Beginning of a bezel scroll gesture started from the |bezel|.
     // |delta| is the difference between the x-coordinate of the current scroll
@@ -52,7 +52,7 @@ class BezelController : public ui::EventHandler {
   };
 
   explicit BezelController(aura::Window* container);
-  virtual ~BezelController() {}
+  ~BezelController() override {}
 
   // Set the delegate to handle the gestures from left and right bezels.
   // Two touch points are need to perform the bezel scroll gesture from
@@ -76,7 +76,7 @@ class BezelController : public ui::EventHandler {
   void SetState(State state, float scroll_delta);
 
   // ui::EventHandler overrides
-  virtual void OnGestureEvent(ui::GestureEvent* event) override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
 
   aura::Window* container_;