C++11 override style change for athena

athena/extensions/shell/athena_shell_app_delegate.h

Index: athena/extensions/shell/athena_shell_app_delegate.h
diff --git a/athena/extensions/shell/athena_shell_app_delegate.h b/athena/extensions/shell/athena_shell_app_delegate.h
index bd0dc229779043170aef4cb6996490597ec2611d..d506f46fc05466a3c2a39d4dcc9ba71989698171 100644
--- a/athena/extensions/shell/athena_shell_app_delegate.h
+++ b/athena/extensions/shell/athena_shell_app_delegate.h
@@ -12,28 +12,28 @@ namespace athena {
 class AthenaShellAppDelegate : public AthenaAppDelegateBase {
  public:
   AthenaShellAppDelegate();
-  virtual ~AthenaShellAppDelegate();
+  ~AthenaShellAppDelegate() override;
 
  private:
   // extensions::AppDelegate:
-  virtual void InitWebContents(content::WebContents* web_contents) override;
-  virtual content::ColorChooser* ShowColorChooser(
+  void InitWebContents(content::WebContents* web_contents) override;
+  content::ColorChooser* ShowColorChooser(
       content::WebContents* web_contents,
       SkColor initial_color) override;
-  virtual void RunFileChooser(
+  void RunFileChooser(
       content::WebContents* tab,
       const content::FileChooserParams& params) override;
-  virtual void RequestMediaAccessPermission(
+  void RequestMediaAccessPermission(
       content::WebContents* web_contents,
       const content::MediaStreamRequest& request,
       const content::MediaResponseCallback& callback,
       const extensions::Extension* extension) override;
-  virtual bool CheckMediaAccessPermission(
+  bool CheckMediaAccessPermission(
       content::WebContents* web_contents,
       const GURL& security_origin,
       content::MediaStreamType type,
       const extensions::Extension* extension) override;
-  virtual void SetWebContentsBlocked(content::WebContents* web_contents,
+  void SetWebContentsBlocked(content::WebContents* web_contents,
                                      bool blocked) override;
 
   DISALLOW_COPY_AND_ASSIGN(AthenaShellAppDelegate);