Add support for ProxyResolverErrorObserver to ProxyResolverMojo.

net/proxy/proxy_service_mojo.cc

Index: net/proxy/proxy_service_mojo.cc
diff --git a/net/proxy/proxy_service_mojo.cc b/net/proxy/proxy_service_mojo.cc
index 5f7fb1fbad5b81f4e4619494f70f35d7ade51387..f5b909ca39a797ee6abeabb041568cbb09125bb0 100644
--- a/net/proxy/proxy_service_mojo.cc
+++ b/net/proxy/proxy_service_mojo.cc
@@ -9,6 +9,7 @@
 #include "net/interfaces/proxy_resolver_service.mojom.h"
 #include "net/proxy/in_process_mojo_proxy_resolver_factory.h"
 #include "net/proxy/mojo_proxy_resolver_impl.h"
+#include "net/proxy/network_delegate_error_observer.h"
 #include "net/proxy/proxy_resolver_mojo.h"
 #include "net/proxy/proxy_resolver_v8_tracing.h"
 #include "net/proxy/proxy_service.h"
@@ -28,8 +29,10 @@ ProxyService* CreateProxyServiceUsingMojoFactory(
   DCHECK(dhcp_proxy_script_fetcher);
   DCHECK(host_resolver);
 
-  ProxyResolverMojo* proxy_resolver =
-      new ProxyResolverMojo(mojo_proxy_factory, host_resolver);
+  ProxyResolverMojo* proxy_resolver = new ProxyResolverMojo(
+      mojo_proxy_factory, host_resolver,
+      make_scoped_ptr(new NetworkDelegateErrorObserver(
+          network_delegate, base::MessageLoopProxy::current().get())));
 
   ProxyService* proxy_service =
       new ProxyService(proxy_config_service, proxy_resolver, net_log);