Standardize usage of virtual/override/final in chrome/browser/

chrome/browser/sessions/persistent_tab_restore_service.h

Index: chrome/browser/sessions/persistent_tab_restore_service.h
diff --git a/chrome/browser/sessions/persistent_tab_restore_service.h b/chrome/browser/sessions/persistent_tab_restore_service.h
index 3d59ab7bed1fba552ae3afcedd24bc294cd65a40..643030dce4964d9c25886dec7167afc880b0f648 100644
--- a/chrome/browser/sessions/persistent_tab_restore_service.h
+++ b/chrome/browser/sessions/persistent_tab_restore_service.h
@@ -22,30 +22,29 @@ class PersistentTabRestoreService : public TabRestoreService {
   PersistentTabRestoreService(Profile* profile,
                               TimeFactory* time_factory);
 
-  virtual ~PersistentTabRestoreService();
+  ~PersistentTabRestoreService() override;
 
   // TabRestoreService:
-  virtual void AddObserver(TabRestoreServiceObserver* observer) override;
-  virtual void RemoveObserver(TabRestoreServiceObserver* observer) override;
-  virtual void CreateHistoricalTab(content::WebContents* contents,
-                                   int index) override;
-  virtual void BrowserClosing(TabRestoreServiceDelegate* delegate) override;
-  virtual void BrowserClosed(TabRestoreServiceDelegate* delegate) override;
-  virtual void ClearEntries() override;
-  virtual const Entries& entries() const override;
-  virtual std::vector<content::WebContents*> RestoreMostRecentEntry(
+  void AddObserver(TabRestoreServiceObserver* observer) override;
+  void RemoveObserver(TabRestoreServiceObserver* observer) override;
+  void CreateHistoricalTab(content::WebContents* contents, int index) override;
+  void BrowserClosing(TabRestoreServiceDelegate* delegate) override;
+  void BrowserClosed(TabRestoreServiceDelegate* delegate) override;
+  void ClearEntries() override;
+  const Entries& entries() const override;
+  std::vector<content::WebContents*> RestoreMostRecentEntry(
       TabRestoreServiceDelegate* delegate,
       chrome::HostDesktopType host_desktop_type) override;
-  virtual Tab* RemoveTabEntryById(SessionID::id_type id) override;
-  virtual std::vector<content::WebContents*> RestoreEntryById(
+  Tab* RemoveTabEntryById(SessionID::id_type id) override;
+  std::vector<content::WebContents*> RestoreEntryById(
       TabRestoreServiceDelegate* delegate,
       SessionID::id_type id,
       chrome::HostDesktopType host_desktop_type,
       WindowOpenDisposition disposition) override;
-  virtual void LoadTabsFromLastSession() override;
-  virtual bool IsLoaded() const override;
-  virtual void DeleteLastSession() override;
-  virtual void Shutdown() override;
+  void LoadTabsFromLastSession() override;
+  bool IsLoaded() const override;
+  void DeleteLastSession() override;
+  void Shutdown() override;
 
  private:
   friend class PersistentTabRestoreServiceTest;