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

remoting/protocol/chromium_socket_factory.cc

 // Copyright 2014 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 "remoting/protocol/chromium_socket_factory.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "jingle/glue/utils.h"
@@ skipping 180 matching lines @@
 
   send_queue_.push_back(PendingPacket(data, data_size, endpoint));
   send_queue_size_ += data_size;
 
   DoSend();
   return data_size;
 }
 
 int UdpPacketSocket::Close() {
   state_ = STATE_CLOSED;
+
+  // This CHECK() was added to debug crbug.com/452121 .
+  //
+  // TODO(sergeyu): Remove once the bug is resolved.
+  CHECK_NE(socket_->Close(), net::ERR_INVALID_HANDLE);
+
   socket_.reset();
   return 0;
 }
 
 rtc::AsyncPacketSocket::State UdpPacketSocket::GetState() const {
   return state_;
 }
 
 int UdpPacketSocket::GetOption(rtc::Socket::Option option, int* value) {
   // This method is never called by libjingle.
@@ skipping 179 matching lines @@
   return nullptr;
 }
 
 rtc::AsyncResolverInterface*
 ChromiumPacketSocketFactory::CreateAsyncResolver() {
   return new rtc::AsyncResolver();
 }
 
 }  // namespace protocol
 }  // namespace remoting