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

chrome/installer/util/non_updating_app_registration_data.h

Index: chrome/installer/util/non_updating_app_registration_data.h
diff --git a/chrome/installer/util/non_updating_app_registration_data.h b/chrome/installer/util/non_updating_app_registration_data.h
index f5d75586963da426d85c9b488343041d49ae0888..a25f97a07c3a199ed2cfcc11c3522223361f3a22 100644
--- a/chrome/installer/util/non_updating_app_registration_data.h
+++ b/chrome/installer/util/non_updating_app_registration_data.h
@@ -14,11 +14,11 @@
 class NonUpdatingAppRegistrationData : public AppRegistrationData {
  public:
   explicit NonUpdatingAppRegistrationData(const base::string16& key_path);
-  virtual ~NonUpdatingAppRegistrationData();
-  virtual base::string16 GetAppGuid() const override;
-  virtual base::string16 GetStateKey() const override;
-  virtual base::string16 GetStateMediumKey() const override;
-  virtual base::string16 GetVersionKey() const override;
+  ~NonUpdatingAppRegistrationData() 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 key_path_;