Disable backup connect jobs for all pools except TCPClientSocketPool

net/socket/tcp_client_socket_pool.cc

Index: net/socket/tcp_client_socket_pool.cc
diff --git a/net/socket/tcp_client_socket_pool.cc b/net/socket/tcp_client_socket_pool.cc
index 8e2b4f0c3d1ea58af45c52c3b7a75e4ccbc80c6d..2c5d63fbd46874cad69ba1e1a4408c4bc9224b88 100644
--- a/net/socket/tcp_client_socket_pool.cc
+++ b/net/socket/tcp_client_socket_pool.cc
@@ -177,7 +177,9 @@ TCPClientSocketPool::TCPClientSocketPool(
             base::TimeDelta::FromSeconds(kUnusedIdleSocketTimeout),
             base::TimeDelta::FromSeconds(kUsedIdleSocketTimeout),
             new TCPConnectJobFactory(client_socket_factory, host_resolver),
-            network_change_notifier) {}
+            network_change_notifier) {
+  base_.enable_backup_jobs();
+}
 
 TCPClientSocketPool::~TCPClientSocketPool() {}