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 8029141a0a4035024cbdc6750079a52447d81917..90a0fd350094abe834068925e040d91a5b83c529 100644
--- a/net/proxy/network_delegate_error_observer.cc
+++ b/net/proxy/network_delegate_error_observer.cc
@@ -73,6 +73,14 @@ NetworkDelegateErrorObserver::~NetworkDelegateErrorObserver() {
   core_->Shutdown();
 }
 
+// static
+scoped_ptr<ProxyResolverErrorObserver> NetworkDelegateErrorObserver::Create(
+    NetworkDelegate* network_delegate,
+    const scoped_refptr<base::MessageLoopProxy>& origin_loop) {
+  return make_scoped_ptr(
+      new NetworkDelegateErrorObserver(network_delegate, origin_loop.get()));
+}
+
 void NetworkDelegateErrorObserver::OnPACScriptError(
     int line_number,
     const base::string16& error) {