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

chrome/browser/value_store/value_store_frontend_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 "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "chrome/browser/value_store/value_store_frontend.h"
@@ skipping 50 matching lines @@
 
   scoped_ptr<ValueStoreFrontend> storage_;
   base::ScopedTempDir temp_dir_;
   base::FilePath db_path_;
   base::MessageLoop message_loop_;
   content::TestBrowserThread ui_thread_;
   content::TestBrowserThread file_thread_;
 };
 
 TEST_F(ValueStoreFrontendTest, GetExistingData) {
-  scoped_ptr<base::Value> value(NULL);
+  scoped_ptr<base::Value> value;
   ASSERT_FALSE(Get("key0", &value));
 
   // Test existing keys in the DB.
   {
     ASSERT_TRUE(Get("key1", &value));
     std::string result;
     ASSERT_TRUE(value->GetAsString(&result));
     EXPECT_EQ("value1", result);
   }
 
   {
     ASSERT_TRUE(Get("key2", &value));
     int result;
     ASSERT_TRUE(value->GetAsInteger(&result));
     EXPECT_EQ(2, result);
   }
 }
 
 TEST_F(ValueStoreFrontendTest, ChangesPersistAfterReload) {
   storage_->Set("key0",
       scoped_ptr<base::Value>(base::Value::CreateIntegerValue(0)));
   storage_->Set("key1",
       scoped_ptr<base::Value>(base::Value::CreateStringValue("new1")));
   storage_->Remove("key2");
 
   // Reload the DB and test our changes.
   ResetStorage();
 
-  scoped_ptr<base::Value> value(NULL);
+  scoped_ptr<base::Value> value;
   {
     ASSERT_TRUE(Get("key0", &value));
     int result;
     ASSERT_TRUE(value->GetAsInteger(&result));
     EXPECT_EQ(0, result);
   }
 
   {
     ASSERT_TRUE(Get("key1", &value));
     std::string result;
     ASSERT_TRUE(value->GetAsString(&result));
     EXPECT_EQ("new1", result);
   }
 
   ASSERT_FALSE(Get("key2", &value));
 }