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

chrome/browser/google/google_url_tracker_navigation_helper_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_NAVIGATION_HELPER_IMPL_H_
 #define CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_NAVIGATION_HELPER_IMPL_H_
 
 #include "components/google/core/browser/google_url_tracker_navigation_helper.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "url/gurl.h"
 
 namespace content {
 class WebContents;
 }
 
 class GoogleURLTrackerNavigationHelperImpl
     : public GoogleURLTrackerNavigationHelper,
       public content::NotificationObserver {
  public:
   GoogleURLTrackerNavigationHelperImpl(content::WebContents* web_contents,
                                        GoogleURLTracker* tracker);
-  virtual ~GoogleURLTrackerNavigationHelperImpl();
+  ~GoogleURLTrackerNavigationHelperImpl() override;
 
   // GoogleURLTrackerNavigationHelper:
-  virtual void SetListeningForNavigationCommit(
-      bool listen) override;
-  virtual bool IsListeningForNavigationCommit() override;
-  virtual void SetListeningForTabDestruction(
-      bool listen) override;
-  virtual bool IsListeningForTabDestruction() override;
-  virtual void OpenURL(GURL url,
-                       WindowOpenDisposition disposition,
-                       bool user_clicked_on_link) override;
+  void SetListeningForNavigationCommit(bool listen) override;
+  bool IsListeningForNavigationCommit() override;
+  void SetListeningForTabDestruction(bool listen) override;
+  bool IsListeningForTabDestruction() override;
+  void OpenURL(GURL url,
+               WindowOpenDisposition disposition,
+               bool user_clicked_on_link) override;
 
  private:
   // content::NotificationObserver:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override;
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
 
   content::WebContents* web_contents_;
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(GoogleURLTrackerNavigationHelperImpl);
 };
 
 #endif  // CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_NAVIGATION_HELPER_IMPL_H_