Fix file descriptor leak in event handler implementation. When shutting down an isolate, we did not…

runtime/bin/eventhandler_win.h

 // Copyright (c) 2012, 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.
 
 #ifndef BIN_EVENTHANDLER_WIN_H_
 #define BIN_EVENTHANDLER_WIN_H_
 
 #if !defined(BIN_EVENTHANDLER_H_)
 #error Do not include eventhandler_win.h directly; use eventhandler.h instead.
 #endif
@@ skipping 342 matching lines @@
 
   LPFN_DISCONNECTEX DisconnectEx_;
   ClientSocket* next_;
 };
 
 
 // Event handler.
 class EventHandlerImplementation {
  public:
   EventHandlerImplementation();
-  virtual ~EventHandlerImplementation() {}
+  virtual ~EventHandlerImplementation();
 
   void SendData(intptr_t id, Dart_Port dart_port, int64_t data);
-  void Start();
+  void Start(EventHandler* handler);
   void Shutdown();
 
   static void EventHandlerEntry(uword args);
 
   DWORD GetTimeout();
   void HandleInterrupt(InterruptMessage* msg);
   void HandleTimeout();
   void HandleAccept(ListenSocket* listen_socket, IOBuffer* buffer);
   void HandleClosed(Handle* handle);
   void HandleError(Handle* handle);
@@ skipping 10 matching lines @@
   ClientSocket* client_sockets_head_;
 
   int64_t timeout_;  // Time for next timeout.
   Dart_Port timeout_port_;
   bool shutdown_;
   HANDLE completion_port_;
 };
 
 
 #endif  // BIN_EVENTHANDLER_WIN_H_