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

chrome/browser/google/google_search_counter.h

Index: chrome/browser/google/google_search_counter.h
diff --git a/chrome/browser/google/google_search_counter.h b/chrome/browser/google/google_search_counter.h
index a8525397708c9eec8842a1e6838eaa2beab0df09..e1f558d1275b27be5b91c4fc3ca88eac6a15cf08 100644
--- a/chrome/browser/google/google_search_counter.h
+++ b/chrome/browser/google/google_search_counter.h
@@ -46,7 +46,7 @@ class GoogleSearchCounter : content::NotificationObserver {
   friend class GoogleSearchCounterAndroidTest;
 
   GoogleSearchCounter();
-  virtual ~GoogleSearchCounter();
+  ~GoogleSearchCounter() override;
 
   void ProcessCommittedEntry(const content::NotificationSource& source,
                              const content::NotificationDetails& details);
@@ -59,9 +59,9 @@ class GoogleSearchCounter : content::NotificationObserver {
   void RegisterForNotificationsInternal();
 
   // 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::NotificationRegistrar registrar_;
   scoped_ptr<GoogleSearchMetrics> search_metrics_;