Add support for ProxyResolverErrorObserver to ProxyResolverMojo.

net/proxy/in_process_mojo_proxy_resolver_factory.cc

Index: net/proxy/in_process_mojo_proxy_resolver_factory.cc
diff --git a/net/proxy/in_process_mojo_proxy_resolver_factory.cc b/net/proxy/in_process_mojo_proxy_resolver_factory.cc
index b38a09359bdce14aa1a7ec4dc3a13be4d873915f..cb1cf21aa911069a01951029811937c8fa1abc5b 100644
--- a/net/proxy/in_process_mojo_proxy_resolver_factory.cc
+++ b/net/proxy/in_process_mojo_proxy_resolver_factory.cc
@@ -30,9 +30,10 @@ InProcessMojoProxyResolverFactory::CreateResolver(
     const mojo::String& pac_script,
     mojo::InterfaceRequest<interfaces::ProxyResolver> req,
     interfaces::HostResolverPtr host_resolver,
+    interfaces::ProxyResolverErrorObserverPtr error_observer,
     interfaces::ProxyResolverFactoryRequestClientPtr client) {
   factory_->CreateResolver(pac_script, req.Pass(), host_resolver.Pass(),
-                           client.Pass());
+                           error_observer.Pass(), client.Pass());
   return nullptr;
 }