Standardize usage of virtual/override/final in components/

components/network_time/network_time_tracker_unittest.cc

Index: components/network_time/network_time_tracker_unittest.cc
diff --git a/components/network_time/network_time_tracker_unittest.cc b/components/network_time/network_time_tracker_unittest.cc
index 60d316eb3c3183fd99813a413812e12b8f5394d5..a401fff97848af6a03d651c3f15698e4b3b23679 100644
--- a/components/network_time/network_time_tracker_unittest.cc
+++ b/components/network_time/network_time_tracker_unittest.cc
@@ -30,11 +30,9 @@ const int64 kPseudoSleepTime2 = 1888;
 class TestTickClock : public base::TickClock {
  public:
   explicit TestTickClock(base::TimeTicks* ticks_now) : ticks_now_(ticks_now) {}
-  virtual ~TestTickClock() {}
+  ~TestTickClock() override {}
 
-  virtual base::TimeTicks NowTicks() override {
-    return *ticks_now_;
-  }
+  base::TimeTicks NowTicks() override { return *ticks_now_; }
 
  private:
   base::TimeTicks* ticks_now_;