json_schema_compiler: Don't use deprecated ListValue::Append(Value*) overload.

tools/json_schema_compiler/test/functions_on_types_unittest.cc

Index: tools/json_schema_compiler/test/functions_on_types_unittest.cc
diff --git a/tools/json_schema_compiler/test/functions_on_types_unittest.cc b/tools/json_schema_compiler/test/functions_on_types_unittest.cc
index 4aa77ed8bb3f1e3fc14f8130eca43d3ea45ff169..055fbc4276a315f44c1fb17262e0a76eeb439ccb 100644
--- a/tools/json_schema_compiler/test/functions_on_types_unittest.cc
+++ b/tools/json_schema_compiler/test/functions_on_types_unittest.cc
@@ -41,7 +41,7 @@ TEST(JsonSchemaCompilerFunctionsOnTypesTest, StorageAreaGetParamsCreate) {
     keys_object_value->SetInteger("integer", 5);
     keys_object_value->SetString("string", "string");
     std::unique_ptr<base::ListValue> params_value(new base::ListValue());
-    params_value->Append(keys_object_value->DeepCopy());
+    params_value->Append(keys_object_value->CreateDeepCopy());
     std::unique_ptr<StorageArea::Get::Params> params(
         StorageArea::Get::Params::Create(*params_value));
     ASSERT_TRUE(params);