Avoid doing concurrent DNS resolves of the same hostname

net/base/tcp_client_socket_unittest.cc

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/tcp_client_socket.h"
 
 #include "base/basictypes.h"
 #include "net/base/address_list.h"
 #include "net/base/host_resolver.h"
 #include "net/base/io_buffer.h"
@@ skipping 69 matching lines @@
     sock = ListenSocket::Listen("127.0.0.1", port, this);
     if (sock)
       break;
   }
   ASSERT_TRUE(sock != NULL);
   listen_sock_ = sock;
   listen_port_ = port;
 
   AddressList addr;
   HostResolver resolver;
-  int rv = resolver.Resolve("localhost", listen_port_, &addr, NULL);
+  int rv = resolver.Resolve("localhost", listen_port_, &addr, NULL, NULL);
   CHECK(rv == OK);
   sock_.reset(new TCPClientSocket(addr));
 }
 
 TEST_F(TCPClientSocketTest, Connect) {
   TestCompletionCallback callback;
   EXPECT_FALSE(sock_->IsConnected());
 
   int rv = sock_->Connect(&callback);
   if (rv != OK) {
@@ skipping 228 matching lines @@
   // Close the server socket, so there will at least be a 0-byte read.
   CloseServerSocket();
 
   rv = callback.WaitForResult();
   EXPECT_GE(rv, 0);
 }
 
 }  // namespace
 
 }  // namespace net