Fix preconnect crash on synchronous socket error.

net/socket/client_socket_pool_base.cc

Index: net/socket/client_socket_pool_base.cc
diff --git a/net/socket/client_socket_pool_base.cc b/net/socket/client_socket_pool_base.cc
index 86ba2dd47212c94da9f2816ba22dbdbd7be52909..816ecc97c456500f8a9543306c9ab6e9e43bc333 100644
--- a/net/socket/client_socket_pool_base.cc
+++ b/net/socket/client_socket_pool_base.cc
@@ -341,8 +341,12 @@ int ClientSocketPoolBaseHelper::RequestSocketInternal(
     group->AddJob(connect_job.release());
   } else {
     LogBoundConnectJobToRequest(connect_job->net_log().source(), request);
-    connect_job->GetAdditionalErrorState(handle);
-    ClientSocket* error_socket = connect_job->ReleaseSocket();
+    ClientSocket* error_socket = NULL;
+    if (!preconnecting) {
+      DCHECK(handle);
+      connect_job->GetAdditionalErrorState(handle);
+      error_socket = connect_job->ReleaseSocket();
+    }
     if (error_socket) {
       HandOutSocket(error_socket, false /* not reused */, handle,
                     base::TimeDelta(), group, request->net_log());