Remove base::Value::CreateNullValue

services/preferences/tracked/pref_hash_calculator_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 "services/preferences/tracked/pref_hash_calculator.h"
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
@@ skipping 58 matching lines @@
   ASSERT_FALSE(calc1.Calculate("pref_path", NULL).empty());
 }
 
 // Tests the output against a known value to catch unexpected algorithm changes.
 // The test hashes below must NEVER be updated, the serialization algorithm used
 // must always be able to generate data that will produce these exact hashes.
 TEST(PrefHashCalculatorTest, CatchHashChanges) {
   static const char kSeed[] = "0123456789ABCDEF0123456789ABCDEF";
   static const char kDeviceId[] = "test_device_id1";
 
-  std::unique_ptr<base::Value> null_value = base::Value::CreateNullValue();
+  auto null_value = base::MakeUnique<base::Value>();
   std::unique_ptr<base::Value> bool_value(new base::Value(false));
   std::unique_ptr<base::Value> int_value(new base::Value(1234567890));
   std::unique_ptr<base::Value> double_value(new base::Value(123.0987654321));
   std::unique_ptr<base::Value> string_value(
       new base::Value("testing with special chars:\n<>{}:^^@#$\\/"));
 
   // For legacy reasons, we have to support pruning of empty lists/dictionaries
   // and nested empty ists/dicts in the hash generation algorithm.
   std::unique_ptr<base::DictionaryValue> nested_empty_dict(
       new base::DictionaryValue);
@@ skipping 97 matching lines @@
 
   // As in PrefHashCalculatorTest.CatchHashChanges.
   const base::Value string_value("testing with special chars:\n<>{}:^^@#$\\/");
   static const char kExpectedValue[] =
       "05ACCBD3B05C45C36CD06190F63EC577112311929D8380E26E5F13182EB68318";
 
   EXPECT_EQ(PrefHashCalculator::VALID_SECURE_LEGACY,
             PrefHashCalculator(kSeed, kNewDeviceId, kLegacyDeviceId)
                 .Validate("pref.path", &string_value, kExpectedValue));
 }