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

content/browser/renderer_host/p2p/socket_host_udp_unittest.cc

 // Copyright (c) 2012 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 "content/browser/renderer_host/p2p/socket_host_udp.h"
 
 #include <deque>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 28 matching lines @@
 class FakeDatagramServerSocket : public net::DatagramServerSocket {
  public:
   typedef std::pair<net::IPEndPoint, std::vector<char> > UDPPacket;
 
   // P2PSocketHostUdp destroyes a socket on errors so sent packets
   // need to be stored outside of this object.
   explicit FakeDatagramServerSocket(std::deque<UDPPacket>* sent_packets)
       : sent_packets_(sent_packets) {
   }
 
-  void Close() override {}
+  int Close() override { return net::OK; }
 
   int GetPeerAddress(net::IPEndPoint* address) const override {
     NOTREACHED();
     return net::ERR_SOCKET_NOT_CONNECTED;
   }
 
   int GetLocalAddress(net::IPEndPoint* address) const override {
     *address = address_;
     return 0;
   }
@@ skipping 307 matching lines @@
   socket_host_->Send(dest3, packet1, options, 0);
   net::IPEndPoint dest4 = ParseAddress(kTestIpAddress1, 2224);
   // This packet should also be dropped.
   socket_host_->Send(dest4, packet1, options, 0);
   // |dest1| is known, we can send as many packets to it.
   socket_host_->Send(dest1_, packet1, options, 0);
   ASSERT_EQ(sent_packets_.size(), 4U);
 }
 
 }  // namespace content