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

chrome/test/chromedriver/chrome/performance_logger_unittest.cc

 // Copyright (c) 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/test/chromedriver/chrome/performance_logger.h"
 
 #include "base/compiler_specific.h"
 #include "base/format_macros.h"
 #include "base/json/json_reader.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 85 matching lines @@
 }
 
 scoped_ptr<DictionaryValue> ParseDictionary(const std::string& json) {
   std::string error;
   scoped_ptr<Value> value(base::JSONReader::ReadAndReturnError(
       json, base::JSON_PARSE_RFC, NULL, &error));
   if (value == NULL) {
     SCOPED_TRACE(json.c_str());
     SCOPED_TRACE(error.c_str());
     ADD_FAILURE();
-    return scoped_ptr<DictionaryValue>(NULL);
+    return scoped_ptr<DictionaryValue>();
   }
   DictionaryValue* dict = NULL;
   if (!value->GetAsDictionary(&dict)) {
     SCOPED_TRACE("JSON object is not a dictionary");
     ADD_FAILURE();
-    return scoped_ptr<DictionaryValue>(NULL);
+    return scoped_ptr<DictionaryValue>();
   }
   return scoped_ptr<DictionaryValue>(dict->DeepCopy());
 }
 
 void ValidateLogEntry(const LogEntry *entry,
                       const std::string& expected_webview,
                       const std::string& expected_method) {
   EXPECT_EQ(Log::kLog, entry->level);
   EXPECT_LT(0, entry->timestamp.ToTimeT());
 
@@ skipping 53 matching lines @@
   ExpectEnableDomains(client1);
   EXPECT_TRUE(client2.PopSentCommand().empty());;
 
   ASSERT_EQ(kOk, client1.TriggerEvent("Page.gaga1").code());
   ASSERT_EQ(kOk, client2.TriggerEvent("Timeline.gaga2").code());
 
   ASSERT_EQ(2u, log.GetEntries().size());
   ValidateLogEntry(log.GetEntries()[0], "webview-1", "Page.gaga1");
   ValidateLogEntry(log.GetEntries()[1], "webview-2", "Timeline.gaga2");
 }