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

chrome/browser/sessions/session_service_unittest.cc

Index: chrome/browser/sessions/session_service_unittest.cc
diff --git a/chrome/browser/sessions/session_service_unittest.cc b/chrome/browser/sessions/session_service_unittest.cc
index 9e11086ac62e29a53265174f3364a0fa42b0f6f0..21a99f49ef052114e14a82a4c8871a8ac5abdcf1 100644
--- a/chrome/browser/sessions/session_service_unittest.cc
+++ b/chrome/browser/sessions/session_service_unittest.cc
@@ -69,9 +69,9 @@ class SessionServiceTest : public BrowserWithTestWindowTest,
   }
 
   // Upon notification, increment the sync_save_count variable
-  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 {
     ASSERT_EQ(type, chrome::NOTIFICATION_SESSION_SERVICE_SAVED);
     sync_save_count_++;
   }