C++11 override style change for athena

athena/extensions/athena_app_delegate_base.h

Index: athena/extensions/athena_app_delegate_base.h
diff --git a/athena/extensions/athena_app_delegate_base.h b/athena/extensions/athena_app_delegate_base.h
index 2c8e6f5024e2cc767084c53d3597aac3b868c058..21b6c31adb159ecd0486b1d72507c38ca48a4d9a 100644
--- a/athena/extensions/athena_app_delegate_base.h
+++ b/athena/extensions/athena_app_delegate_base.h
@@ -14,28 +14,28 @@ namespace athena {
 class AthenaAppDelegateBase : public extensions::AppDelegate {
  public:
   AthenaAppDelegateBase();
-  virtual ~AthenaAppDelegateBase();
+  ~AthenaAppDelegateBase() override;
 
  private:
   class NewActivityContentsDelegate;
 
   // extensions::AppDelegate:
-  virtual void ResizeWebContents(content::WebContents* web_contents,
+  void ResizeWebContents(content::WebContents* web_contents,
                                  const gfx::Size& size) override;
-  virtual content::WebContents* OpenURLFromTab(
+  content::WebContents* OpenURLFromTab(
       content::BrowserContext* context,
       content::WebContents* source,
       const content::OpenURLParams& params) override;
-  virtual void AddNewContents(content::BrowserContext* context,
+  void AddNewContents(content::BrowserContext* context,
                               content::WebContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
                               bool user_gesture,
                               bool* was_blocked) override;
-  virtual int PreferredIconSize() override;
-  virtual bool IsWebContentsVisible(
+  int PreferredIconSize() override;
+  bool IsWebContentsVisible(
       content::WebContents* web_contents) override;
-  virtual void SetTerminatingCallback(const base::Closure& callback) override;
+  void SetTerminatingCallback(const base::Closure& callback) override;
 
   scoped_ptr<NewActivityContentsDelegate> new_window_contents_delegate_;
   base::Closure terminating_callback_;