Standardize usage of virtual/override/final in components/

components/network_time/network_time_tracker_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/network_time/network_time_tracker.h"
 
 #include <math.h>
 
 #include "base/compiler_specific.h"
 #include "base/prefs/testing_pref_service.h"
@@ skipping 12 matching lines @@
 const int64 kResolution1 = 17;
 const int64 kResolution2 = 177;
 
 const int64 kPseudoSleepTime1 = 500000001;
 const int64 kPseudoSleepTime2 = 1888;
 
 // A custom tick clock that will return an arbitrary time.
 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_;
 };
 
 }  // namespace
 
 class NetworkTimeTrackerTest : public testing::Test {
  public:
   virtual ~NetworkTimeTrackerTest() {}
@@ skipping 106 matching lines @@
   AddToTicksNow(kPseudoSleepTime2);
   UpdateNetworkTime(
       old_now,
       base::TimeDelta::FromMilliseconds(kResolution2),
       base::TimeDelta::FromMilliseconds(kLatency2),
       old_ticks);
   EXPECT_TRUE(ValidateExpectedTime());
 }
 
 }  // namespace network_time