Rewrite simple uses of base::ListValue::Append(base::Value*) on CrOS.

chromeos/network/network_state_handler_unittest.cc

Index: chromeos/network/network_state_handler_unittest.cc
diff --git a/chromeos/network/network_state_handler_unittest.cc b/chromeos/network/network_state_handler_unittest.cc
index 8c9245f150e22eae083a14dca659f9b841e488c1..73245ac3181d2593491674e85bf93b8b993af178 100644
--- a/chromeos/network/network_state_handler_unittest.cc
+++ b/chromeos/network/network_state_handler_unittest.cc
@@ -787,7 +787,7 @@ TEST_F(NetworkStateHandlerTest, IPConfigChanged) {
   base::DictionaryValue ip_config_properties;
   ip_config_test->AddIPConfig(kIPConfigPath, ip_config_properties);
   base::ListValue device_ip_configs;
-  device_ip_configs.Append(new base::StringValue(kIPConfigPath));
+  device_ip_configs.AppendString(kIPConfigPath);
   device_test_->SetDeviceProperty(
       kShillManagerClientStubWifiDevice, shill::kIPConfigsProperty,
       device_ip_configs);