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

chrome/browser/extensions/token_cache/token_cache_service.h

Index: chrome/browser/extensions/token_cache/token_cache_service.h
diff --git a/chrome/browser/extensions/token_cache/token_cache_service.h b/chrome/browser/extensions/token_cache/token_cache_service.h
index c90e74a8466d569bc3b01ac7c847266dad341fea..feb634b447658d7fb973f5f049c19c78fd0ac1b1 100644
--- a/chrome/browser/extensions/token_cache/token_cache_service.h
+++ b/chrome/browser/extensions/token_cache/token_cache_service.h
@@ -25,7 +25,7 @@ class TokenCacheService : public KeyedService,
                           public SigninManagerBase::Observer {
  public:
   explicit TokenCacheService(Profile* profile);
-  virtual ~TokenCacheService();
+  ~TokenCacheService() override;
 
   // Store a token for the currently logged in user. We will look it up later by
   // the name given here, and we will expire the token after the timeout.  For a
@@ -39,15 +39,15 @@ class TokenCacheService : public KeyedService,
   std::string RetrieveToken(const std::string& token_name);
 
   // KeyedService:
-  virtual void Shutdown() override;
+  void Shutdown() override;
 
  private:
   friend class TokenCacheTest;
   FRIEND_TEST_ALL_PREFIXES(TokenCacheTest, SignoutTest);
 
   // SigninManagerBase::Observer:
-  virtual void GoogleSignedOut(const std::string& account_id,
-                               const std::string& username) override;
+  void GoogleSignedOut(const std::string& account_id,
+                       const std::string& username) override;
 
   struct TokenCacheData {
     std::string token;