Standardize usage of virtual/override/final in apps/

apps/app_restore_service.h

Index: apps/app_restore_service.h
diff --git a/apps/app_restore_service.h b/apps/app_restore_service.h
index 5738b0558dbf181c571fd494cb0edc8c29ef1d9a..fec9ed79295c640cb3c6697a681950c04ffb3823 100644
--- a/apps/app_restore_service.h
+++ b/apps/app_restore_service.h
@@ -42,16 +42,14 @@ class AppRestoreService : public KeyedService,
 
  private:
   // AppLifetimeMonitor::Observer.
-  virtual void OnAppStart(Profile* profile, const std::string& app_id) override;
-  virtual void OnAppActivated(Profile* profile,
-                              const std::string& app_id) override;
-  virtual void OnAppDeactivated(Profile* profile,
-                                const std::string& app_id) override;
-  virtual void OnAppStop(Profile* profile, const std::string& app_id) override;
-  virtual void OnChromeTerminating() override;
+  void OnAppStart(Profile* profile, const std::string& app_id) override;
+  void OnAppActivated(Profile* profile, const std::string& app_id) override;
+  void OnAppDeactivated(Profile* profile, const std::string& app_id) override;
+  void OnAppStop(Profile* profile, const std::string& app_id) override;
+  void OnChromeTerminating() override;
 
   // KeyedService.
-  virtual void Shutdown() override;
+  void Shutdown() override;
 
   void RecordAppStart(const std::string& extension_id);
   void RecordAppStop(const std::string& extension_id);