Standardize usage of virtual/override/final in components/

components/signin/core/browser/mutable_profile_oauth2_token_service_unittest.cc

Index: components/signin/core/browser/mutable_profile_oauth2_token_service_unittest.cc
diff --git a/components/signin/core/browser/mutable_profile_oauth2_token_service_unittest.cc b/components/signin/core/browser/mutable_profile_oauth2_token_service_unittest.cc
index b7e9a3aa913020778d74a01e5ff532f50f839780..d53f42751000d27c17e5436a274dd6ea97a3dcfe 100644
--- a/components/signin/core/browser/mutable_profile_oauth2_token_service_unittest.cc
+++ b/components/signin/core/browser/mutable_profile_oauth2_token_service_unittest.cc
@@ -65,21 +65,17 @@ class MutableProfileOAuth2TokenServiceTest
   }
 
   // OAuth2TokenService::Observer implementation.
-  virtual void OnRefreshTokenAvailable(const std::string& account_id) override {
+  void OnRefreshTokenAvailable(const std::string& account_id) override {
     ++token_available_count_;
   }
-  virtual void OnRefreshTokenRevoked(const std::string& account_id) override {
+  void OnRefreshTokenRevoked(const std::string& account_id) override {
     ++token_revoked_count_;
   }
-  virtual void OnRefreshTokensLoaded() override { ++tokens_loaded_count_; }
+  void OnRefreshTokensLoaded() override { ++tokens_loaded_count_; }
 
-  virtual void OnStartBatchChanges() override {
-    ++start_batch_changes_;
-  }
+  void OnStartBatchChanges() override { ++start_batch_changes_; }
 
-  virtual void OnEndBatchChanges() override {
-    ++end_batch_changes_;
-  }
+  void OnEndBatchChanges() override { ++end_batch_changes_; }
 
   void ResetObserverCounts() {
     token_available_count_ = 0;