Show parse errors in the UI when loading ONC files.

chrome/browser/policy/network_configuration_updater.cc

Index: chrome/browser/policy/network_configuration_updater.cc
===================================================================
--- chrome/browser/policy/network_configuration_updater.cc	(revision 114539)
+++ chrome/browser/policy/network_configuration_updater.cc	(working copy)
@@ -56,8 +56,11 @@
 
   if (*cached_value != new_network_config) {
     *cached_value = new_network_config;
-    if (!network_library_->LoadOncNetworks(new_network_config, ""))
-      LOG(WARNING) << "Network library failed to load ONC configuration.";
+    std::string error;
+    if (!network_library_->LoadOncNetworks(new_network_config, "", &error)) {
+      LOG(WARNING) << "Network library failed to load ONC configuration:"
+          << error;
+    }
   }
 }