Remove base::Value::CreateNullValue

tools/json_schema_compiler/test/simple_api_unittest.cc

Index: tools/json_schema_compiler/test/simple_api_unittest.cc
diff --git a/tools/json_schema_compiler/test/simple_api_unittest.cc b/tools/json_schema_compiler/test/simple_api_unittest.cc
index 29d76373c8a18e15fbe17a8167e5f9be9019bfb9..54c773f2174c51f8a780ec1e4668796d49f86c72 100644
--- a/tools/json_schema_compiler/test/simple_api_unittest.cc
+++ b/tools/json_schema_compiler/test/simple_api_unittest.cc
@@ -4,6 +4,7 @@
 
 #include "tools/json_schema_compiler/test/simple_api.h"
 
+#include "base/memory/ptr_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using namespace test::api::simple_api;
@@ -77,7 +78,7 @@ TEST(JsonSchemaCompilerSimpleTest, OptionalStringParamsCreate) {
 TEST(JsonSchemaCompilerSimpleTest, OptionalParamsTakingNull) {
   {
     std::unique_ptr<base::ListValue> params_value(new base::ListValue());
-    params_value->Append(base::Value::CreateNullValue());
+    params_value->Append(base::MakeUnique<base::Value>());
     std::unique_ptr<OptionalString::Params> params(
         OptionalString::Params::Create(*params_value));
     EXPECT_TRUE(params.get());
@@ -98,7 +99,7 @@ TEST(JsonSchemaCompilerSimpleTest, OptionalStringParamsWrongType) {
 TEST(JsonSchemaCompilerSimpleTest, OptionalBeforeRequired) {
   {
     std::unique_ptr<base::ListValue> params_value(new base::ListValue());
-    params_value->Append(base::Value::CreateNullValue());
+    params_value->Append(base::MakeUnique<base::Value>());
     params_value->AppendString("asdf");
     std::unique_ptr<OptionalBeforeRequired::Params> params(
         OptionalBeforeRequired::Params::Create(*params_value));