Update {virtual,override} to follow C++11 style in chrome.

chrome/installer/util/updating_app_registration_data.h

Index: chrome/installer/util/updating_app_registration_data.h
diff --git a/chrome/installer/util/updating_app_registration_data.h b/chrome/installer/util/updating_app_registration_data.h
index e8afdd31b68465ce3ef501c51c9682a4e26b740b..d9114b9add613a52c757421129563e7ce9a2e1fc 100644
--- a/chrome/installer/util/updating_app_registration_data.h
+++ b/chrome/installer/util/updating_app_registration_data.h
@@ -14,11 +14,11 @@
 class UpdatingAppRegistrationData : public AppRegistrationData {
  public:
   explicit UpdatingAppRegistrationData(const base::string16& app_guid);
-  virtual ~UpdatingAppRegistrationData();
-  virtual base::string16 GetAppGuid() const override;
-  virtual base::string16 GetStateKey() const override;
-  virtual base::string16 GetStateMediumKey() const override;
-  virtual base::string16 GetVersionKey() const override;
+  ~UpdatingAppRegistrationData() override;
+  base::string16 GetAppGuid() const override;
+  base::string16 GetStateKey() const override;
+  base::string16 GetStateMediumKey() const override;
+  base::string16 GetVersionKey() const override;
 
  private:
   const base::string16 app_guid_;