Rewrite simple uses of base::ListValue::Append() taking a raw pointer var.

tools/json_schema_compiler/test/additional_properties_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 "tools/json_schema_compiler/test/additional_properties.h"
 
 #include <memory>
+#include <utility>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 using namespace test::api::additional_properties;
 
 TEST(JsonSchemaCompilerAdditionalPropertiesTest,
     AdditionalPropertiesTypePopulate) {
   {
     std::unique_ptr<base::ListValue> list_value(new base::ListValue());
     list_value->AppendString("asdf");
@@ skipping 34 matching lines @@
 }
 
 TEST(JsonSchemaCompilerAdditionalPropertiesTest,
     ReturnAdditionalPropertiesResultCreate) {
   ReturnAdditionalProperties::Results::ResultObject result_object;
   result_object.integer = 5;
   result_object.additional_properties["key"] = "value";
 
   base::ListValue expected;
   {
-    base::DictionaryValue* dict = new base::DictionaryValue();
+    std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
     dict->SetInteger("integer", 5);
     dict->SetString("key", "value");
-    expected.Append(dict);
+    expected.Append(std::move(dict));
   }
 
   EXPECT_TRUE(base::Value::Equals(
       ReturnAdditionalProperties::Results::Create(result_object).get(),
       &expected));
 }