Add CHECK() in UdpSocketLibevent to debug crbug.com/452121

net/udp/udp_client_socket.cc

 // Copyright (c) 2011 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/udp/udp_client_socket.h"
 
 #include "net/base/net_errors.h"
 #include "net/base/net_log.h"
 
 namespace net {
@@ skipping 20 matching lines @@
                           const CompletionCallback& callback) {
   return socket_.Read(buf, buf_len, callback);
 }
 
 int UDPClientSocket::Write(IOBuffer* buf,
                           int buf_len,
                           const CompletionCallback& callback) {
   return socket_.Write(buf, buf_len, callback);
 }
 
-void UDPClientSocket::Close() {
+int UDPClientSocket::Close() {
   socket_.Close();
+  return OK;
 }
 
 int UDPClientSocket::GetPeerAddress(IPEndPoint* address) const {
   return socket_.GetPeerAddress(address);
 }
 
 int UDPClientSocket::GetLocalAddress(IPEndPoint* address) const {
   return socket_.GetLocalAddress(address);
 }
 
 int UDPClientSocket::SetReceiveBufferSize(int32 size) {
   return socket_.SetReceiveBufferSize(size);
 }
 
 int UDPClientSocket::SetSendBufferSize(int32 size) {
   return socket_.SetSendBufferSize(size);
 }
 
 const BoundNetLog& UDPClientSocket::NetLog() const {
   return socket_.NetLog();
 }
 
 #if defined(OS_WIN)
 void UDPClientSocket::UseNonBlockingIO() {
   socket_.UseNonBlockingIO();
 }
 #endif
 
 }  // namespace net