Rewrite scoped_ptr<T>(NULL) to use the default ctor in chrome/.

chrome/renderer/translate/translate_helper_metrics_unittest.cc

 // Copyright 2013 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 "chrome/renderer/translate/translate_helper_metrics.h"
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_samples.h"
 #include "base/metrics/statistics_recorder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 using base::HistogramBase;
 using base::HistogramSamples;
 using base::SampleCountIterator;
 using base::StatisticsRecorder;
 using base::TimeTicks;
 
 namespace {
 
 const int kTrue = 1;
 const int kFalse = 0;
 
 class MetricsRecorder {
  public:
-  explicit MetricsRecorder(const char* key)
-      : key_(key),
-        base_samples_(NULL),
-        samples_(NULL) {
+  explicit MetricsRecorder(const char* key) : key_(key) {
     StatisticsRecorder::Initialize();
 
     HistogramBase* histogram = StatisticsRecorder::FindHistogram(key_);
     if (histogram)
       base_samples_ = histogram->SnapshotSamples();
   }
 
   void CheckLanguage(TranslateHelperMetrics::MetricsNameIndex index,
                      int expected_not_provided,
                      int expected_valid,
@@ skipping 239 matching lines @@
       TranslateHelperMetrics::UMA_LANGUAGE_DETECTION));
   recorder.CheckTotalCount(0);
   TimeTicks begin = TimeTicks::Now();
   TimeTicks end = begin + base::TimeDelta::FromMicroseconds(9009);
   TranslateHelperMetrics::ReportLanguageDetectionTime(begin, end);
   recorder.CheckValueInLogs(9.009);
   recorder.CheckTotalCount(1);
 }
 
 #endif  // defined(ENABLE_LANGUAGE_DETECTION)