Standardize usage of virtual/override/final specifiers.

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 24 matching lines @@
   base::TimeTicks NowTicks() override { return *ticks_now_; }
 
  private:
   base::TimeTicks* ticks_now_;
 };
 
 }  // namespace
 
 class NetworkTimeTrackerTest : public testing::Test {
  public:
-  virtual ~NetworkTimeTrackerTest() {}
+  ~NetworkTimeTrackerTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     NetworkTimeTracker::RegisterPrefs(pref_service_.registry());
 
     now_ = base::Time::NowFromSystemTime();
     network_time_tracker_.reset(new NetworkTimeTracker(
         scoped_ptr<base::TickClock>(new TestTickClock(&ticks_now_)),
         &pref_service_));
   }
 
   base::Time Now() const {
     return now_ + (ticks_now_ - base::TimeTicks());
@@ skipping 94 matching lines @@
   AddToTicksNow(kPseudoSleepTime2);
   UpdateNetworkTime(
       old_now,
       base::TimeDelta::FromMilliseconds(kResolution2),
       base::TimeDelta::FromMilliseconds(kLatency2),
       old_ticks);
   EXPECT_TRUE(ValidateExpectedTime());
 }
 
 }  // namespace network_time