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

net/dns/mock_mdns_socket_factory.h

 // Copyright 2013 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.
 
 #ifndef NET_DNS_MOCK_MDNS_SOCKET_FACTORY_H_
 #define NET_DNS_MOCK_MDNS_SOCKET_FACTORY_H_
 
 #include <string>
 
 #include "net/dns/mdns_client_impl.h"
@@ skipping 18 matching lines @@
   virtual int SendTo(IOBuffer* buf, int buf_len, const IPEndPoint& address,
                      const CompletionCallback& callback) override;
 
   MOCK_METHOD3(SendToInternal, int(const std::string& packet,
                                    const std::string address,
                                    const CompletionCallback& callback));
 
   MOCK_METHOD1(SetReceiveBufferSize, int(int32 size));
   MOCK_METHOD1(SetSendBufferSize, int(int32 size));
 
-  MOCK_METHOD0(Close, void());
+  MOCK_METHOD0(Close, int());
 
   MOCK_CONST_METHOD1(GetPeerAddress, int(IPEndPoint* address));
   virtual int GetLocalAddress(IPEndPoint* address) const override;
   MOCK_CONST_METHOD0(NetLog, const BoundNetLog&());
 
   MOCK_METHOD0(AllowAddressReuse, void());
   MOCK_METHOD0(AllowBroadcast, void());
 
   MOCK_CONST_METHOD1(JoinGroup, int(const IPAddressNumber& group_address));
   MOCK_CONST_METHOD1(LeaveGroup, int(const IPAddressNumber& address));
@@ skipping 45 matching lines @@
                     ScopedVector<DatagramServerSocket>* sockets);
 
   scoped_refptr<IOBuffer> recv_buffer_;
   int recv_buffer_size_;
   CompletionCallback recv_callback_;
 };
 
 }  // namespace net
 
 #endif  // NET_DNS_MOCK_MDNS_SOCKET_FACTORY_H_