C++11 override style change for athena

athena/extensions/chrome/athena_extension_install_ui.h

Index: athena/extensions/chrome/athena_extension_install_ui.h
diff --git a/athena/extensions/chrome/athena_extension_install_ui.h b/athena/extensions/chrome/athena_extension_install_ui.h
index 9d66c7de036836465be50fdd4977b383a65a29df..f17965d243e0d7bcbb2cd66a731767da2cc4f498 100644
--- a/athena/extensions/chrome/athena_extension_install_ui.h
+++ b/athena/extensions/chrome/athena_extension_install_ui.h
@@ -16,17 +16,16 @@ namespace athena {
 class AthenaExtensionInstallUI : public extensions::ExtensionInstallUI {
  public:
   AthenaExtensionInstallUI();
-  virtual ~AthenaExtensionInstallUI();
+  ~AthenaExtensionInstallUI() override;
 
   // ExtensionInstallUI:
-  virtual void OnInstallSuccess(const extensions::Extension* extension,
-                                const SkBitmap* icon) override;
-  virtual void OnInstallFailure(
-      const extensions::CrxInstallerError& error) override;
-  virtual void SetUseAppInstalledBubble(bool use_bubble) override;
-  virtual void OpenAppInstalledUI(const std::string& app_id) override;
-  virtual void SetSkipPostInstallUI(bool skip_ui) override;
-  virtual gfx::NativeWindow GetDefaultInstallDialogParent() override;
+  void OnInstallSuccess(const extensions::Extension* extension,
+                        const SkBitmap* icon) override;
+  void OnInstallFailure(const extensions::CrxInstallerError& error) override;
+  void SetUseAppInstalledBubble(bool use_bubble) override;
+  void OpenAppInstalledUI(const std::string& app_id) override;
+  void SetSkipPostInstallUI(bool skip_ui) override;
+  gfx::NativeWindow GetDefaultInstallDialogParent() override;
 
  private:
   // Whether or not to show the default UI after completing the installation.