Add ProxyResolverFactoryV8Tracing.

net/proxy/network_delegate_error_observer.cc

Index: net/proxy/network_delegate_error_observer.cc
diff --git a/net/proxy/network_delegate_error_observer.cc b/net/proxy/network_delegate_error_observer.cc
index e92065beaefffa1ed0583e89281f70e2d08a7ab1..1bb0537d6cdaa6dad357692a319e54fe2a75426d 100644
--- a/net/proxy/network_delegate_error_observer.cc
+++ b/net/proxy/network_delegate_error_observer.cc
@@ -74,6 +74,14 @@ NetworkDelegateErrorObserver::~NetworkDelegateErrorObserver() {
   core_->Shutdown();
 }
 
+// static
+scoped_ptr<ProxyResolverErrorObserver> NetworkDelegateErrorObserver::Create(
+    NetworkDelegate* network_delegate,
+    const scoped_refptr<base::SingleThreadTaskRunner>& origin_runner) {
+  return make_scoped_ptr(
+      new NetworkDelegateErrorObserver(network_delegate, origin_runner.get()));
+}
+
 void NetworkDelegateErrorObserver::OnPACScriptError(
     int line_number,
     const base::string16& error) {