Change error message for WebSocket tunnel failure.

net/websockets/websocket_test_util.cc

Index: net/websockets/websocket_test_util.cc
diff --git a/net/websockets/websocket_test_util.cc b/net/websockets/websocket_test_util.cc
index 6091c9e0be16a1a95d48e2c7cb7ba5f37b41eda7..0b0b8c04a248787790c106288b012cfb4dc6809d 100644
--- a/net/websockets/websocket_test_util.cc
+++ b/net/websockets/websocket_test_util.cc
@@ -11,6 +11,7 @@
 #include "base/memory/scoped_vector.h"
 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
+#include "net/proxy/proxy_service.h"
 #include "net/socket/socket_test_util.h"
 
 namespace net {
@@ -151,6 +152,13 @@ void WebSocketTestURLRequestContextHost::AddSSLSocketDataProvider(
   maker_.AddSSLSocketDataProvider(ssl_socket_data.Pass());
 }
 
+void WebSocketTestURLRequestContextHost::SetProxyConfig(
+    const std::string& proxy_rules) {
+  DCHECK(!url_request_context_initialized_);
+  proxy_service_.reset(ProxyService::CreateFixed(proxy_rules));
+  url_request_context_.set_proxy_service(proxy_service_.get());
+}
+
 TestURLRequestContext*
 WebSocketTestURLRequestContextHost::GetURLRequestContext() {
   if (!url_request_context_initialized_) {