Remove base::Value::CreateNullValue

tools/json_schema_compiler/test/error_generation_unittest.cc

Index: tools/json_schema_compiler/test/error_generation_unittest.cc
diff --git a/tools/json_schema_compiler/test/error_generation_unittest.cc b/tools/json_schema_compiler/test/error_generation_unittest.cc
index e55ecb988c73d3844e0be3ea834cec5266d77aa5..9c22682bbf1409b6c9b832c417282602d6ff3055 100644
--- a/tools/json_schema_compiler/test/error_generation_unittest.cc
+++ b/tools/json_schema_compiler/test/error_generation_unittest.cc
@@ -100,8 +100,7 @@ TEST(JsonSchemaCompilerErrorTest, ParamIsRequired) {
     EXPECT_TRUE(TestFunction::Params::Create(*params_value, &error));
   }
   {
-    std::unique_ptr<base::ListValue> params_value =
-        List(base::Value::CreateNullValue().release());
+    std::unique_ptr<base::ListValue> params_value = List(new Value());
     base::string16 error;
     EXPECT_FALSE(TestFunction::Params::Create(*params_value, &error));
     EXPECT_TRUE(EqualsUtf16("'num' is required", error));