Standardize usage of virtual/override/final in components/

components/metrics/daily_event_unittest.cc

Index: components/metrics/daily_event_unittest.cc
diff --git a/components/metrics/daily_event_unittest.cc b/components/metrics/daily_event_unittest.cc
index a43b60b4bed7d1c4b96b2b50e7ed8ac3e122142d..d15def116cd5391f4e37f450957909064ce2710e 100644
--- a/components/metrics/daily_event_unittest.cc
+++ b/components/metrics/daily_event_unittest.cc
@@ -20,9 +20,7 @@ class TestDailyObserver : public DailyEvent::Observer {
 
   bool fired() const { return fired_; }
 
-  virtual void OnDailyEvent() override {
-    fired_ = true;
-  }
+  void OnDailyEvent() override { fired_ = true; }
 
   void Reset() {
     fired_ = false;