Remove base::Value::CreateNullValue

content/renderer/stats_collection_controller.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 "content/renderer/stats_collection_controller.h"
 
 #include "base/json/json_writer.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/strings/string_util.h"
 #include "content/common/child_process_messages.h"
 #include "content/renderer/render_view_impl.h"
 #include "gin/handle.h"
 #include "gin/object_template_builder.h"
 #include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebView.h"
@@ skipping 30 matching lines @@
 // {'load_start_ms': 1, 'load_duration_ms': 2.5}
 // either value may be null if a web contents hasn't fully loaded.
 // load_start_ms is represented as milliseconds since the unix epoch.
 void ConvertLoadTimeToJSON(
     const base::Time& load_start_time,
     const base::Time& load_stop_time,
     std::string *result) {
   base::DictionaryValue item;
 
   if (load_start_time.is_null()) {
-    item.Set("load_start_ms", base::Value::CreateNullValue());
+    item.Set("load_start_ms", base::MakeUnique<base::Value>());
   } else {
     item.SetDouble("load_start_ms", (load_start_time - base::Time::UnixEpoch())
                    .InMillisecondsF());
   }
   if (load_start_time.is_null() || load_stop_time.is_null()) {
-    item.Set("load_duration_ms", base::Value::CreateNullValue());
+    item.Set("load_duration_ms", base::MakeUnique<base::Value>());
   } else {
     item.SetDouble("load_duration_ms",
         (load_stop_time - load_start_time).InMillisecondsF());
   }
   base::JSONWriter::Write(item, result);
 }
 
 }  // namespace
 
 // static
@@ skipping 76 matching lines @@
   }
 
   std::string tab_timing_json;
   ConvertLoadTimeToJSON(
       observer->load_start_time(), observer->load_stop_time(),
       &tab_timing_json);
   return tab_timing_json;
 }
 
 }  // namespace content