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

chrome/browser/history/expire_history_backend_unittest.cc

Index: chrome/browser/history/expire_history_backend_unittest.cc
diff --git a/chrome/browser/history/expire_history_backend_unittest.cc b/chrome/browser/history/expire_history_backend_unittest.cc
index 2de4b391ecd4447e82d98f0ccbb12cfb9f492134..e7439cb6b66be107cf5462c987c68b4d6708c7d5 100644
--- a/chrome/browser/history/expire_history_backend_unittest.cc
+++ b/chrome/browser/history/expire_history_backend_unittest.cc
@@ -148,17 +148,16 @@ class ExpireHistoryTest : public testing::Test,
   }
 
   // BroadcastNotificationDelegate:
-  virtual void BroadcastNotifications(
-      int type,
-      scoped_ptr<HistoryDetails> details) override {
+  void BroadcastNotifications(int type,
+                              scoped_ptr<HistoryDetails> details) override {
     // This gets called when there are notifications to broadcast. Instead, we
     // store them so we can tell that the correct notifications were sent.
     notifications_.push_back(std::make_pair(type, details.release()));
   }
-  virtual void NotifySyncURLsModified(URLRows* rows) override {}
-  virtual void NotifySyncURLsDeleted(bool all_history,
-                                     bool expired,
-                                     URLRows* rows) override {}
+  void NotifySyncURLsModified(URLRows* rows) override {}
+  void NotifySyncURLsDeleted(bool all_history,
+                             bool expired,
+                             URLRows* rows) override {}
 };
 
 // The example data consists of 4 visits. The middle two visits are to the