Close 'accepted' sockets when listening socket is closed. Fixes raw_server_socket_cancel_test.

runtime/bin/eventhandler_win.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/eventhandler.h"
 
 #include <process.h>  // NOLINT
@@ skipping 417 matching lines @@
         accepted_tail_ = client_socket;
       } else {
         ASSERT(accepted_tail_ != NULL);
         accepted_tail_->set_next(client_socket);
         accepted_tail_ = client_socket;
       }
     } else {
       Log::PrintErr("setsockopt failed: %d\n", WSAGetLastError());
       closesocket(buffer->client());
     }
+  } else {
+    // Close the socket, as it's already accepted.
+    closesocket(buffer->client());
   }
 
   pending_accept_count_--;
   IOBuffer::DisposeBuffer(buffer);
 }
 
 
 void ListenSocket::DoClose() {
   closesocket(socket());
   handle_ = INVALID_HANDLE_VALUE;
@@ skipping 561 matching lines @@
 
 
 void EventHandlerImplementation::Shutdown() {
   SendData(kShutdownId, 0, 0);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)