The failing test:
ProxySettingsApiTest.ProxyEventsInvalidProxy
is because extensions::ProxyEventRouter::OnProxyError() is not called when the network service is enabled.
In the non-network service case, ChromeNetworkDelegate forwards OnResponseStarted to ChromeExtensionsNetworkDelegate, which identifies proxy errors, and sends an event to any listeners that registered with chrome.proxy.onProxyError.addListener.
The other notifier for onProxyError is PAC script errors ( Issue 851609 ).
Comment 1 by bugdroid1@chromium.org
, Aug 22