Add embedder-specific headers to HTTP CONNECT tunnel request

net/socket/client_socket_pool_manager.cc

Index: net/socket/client_socket_pool_manager.cc
diff --git a/net/socket/client_socket_pool_manager.cc b/net/socket/client_socket_pool_manager.cc
index a7bf1fe5b753bc7796b1019c7260649f06a6bc06..08fc487c3b0481587a5baf3cd357ac5d6dfd3401 100644
--- a/net/socket/client_socket_pool_manager.cc
+++ b/net/socket/client_socket_pool_manager.cc
@@ -197,7 +197,8 @@ int InitSocketPoolHelper(const GURL& request_url,
                                     session->http_auth_cache(),
                                     session->http_auth_handler_factory(),
                                     session->spdy_session_pool(),
-                                    force_tunnel || using_ssl);
+                                    force_tunnel || using_ssl,
+                                    session->params().proxy_delegate);
     } else {
       DCHECK(proxy_info.is_socks());
       char socks_version;