Show notifications for Network Config errors

chromeos/network/network_handler_callbacks.h

Index: chromeos/network/network_handler_callbacks.h
diff --git a/chromeos/network/network_handler_callbacks.h b/chromeos/network/network_handler_callbacks.h
index 8ba2f7d850400dbb9d6db56e39279c3754be99bb..92fb1d1aeef579bdf0fccd7e6945bb687145aeab 100644
--- a/chromeos/network/network_handler_callbacks.h
+++ b/chromeos/network/network_handler_callbacks.h
@@ -19,6 +19,11 @@ class DictionaryValue;
 namespace chromeos {
 namespace network_handler {
 
+CHROMEOS_EXPORT extern const char kErrorName[];
+CHROMEOS_EXPORT extern const char kErrorDetail[];
+CHROMEOS_EXPORT extern const char kDbusErrorName[];
+CHROMEOS_EXPORT extern const char kDbusErrorMessage[];
+
 // An error callback used by both the configuration handler and the state
 // handler to receive error results from the API.
 typedef base::Callback<