Standardize usage of virtual/override/final specifiers in base/.

base/metrics/statistics_recorder_unittest.cc

 // Copyright (c) 2012 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 <vector>
 
 #include "base/json/json_reader.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 class StatisticsRecorderTest : public testing::Test {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     // Each test will have a clean state (no Histogram / BucketRanges
     // registered).
     InitializeStatisticsRecorder();
   }
 
-  virtual void TearDown() {
-    UninitializeStatisticsRecorder();
-  }
+  void TearDown() override { UninitializeStatisticsRecorder(); }
 
   void InitializeStatisticsRecorder() {
     statistics_recorder_ = new StatisticsRecorder();
   }
 
   void UninitializeStatisticsRecorder() {
     delete statistics_recorder_;
     statistics_recorder_ = NULL;
   }
 
@@ skipping 271 matching lines @@
 
   json.clear();
   UninitializeStatisticsRecorder();
 
   // No data should be returned.
   json = StatisticsRecorder::ToJSON(query);
   EXPECT_TRUE(json.empty());
 }
 
 }  // namespace base