Properly initialize eventhandler mask for all handles on Windows.

runtime/bin/eventhandler_win.cc

 // 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.
 
 #include "bin/eventhandler.h"
 
 #include <process.h>
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #include <mswsock.h>
@@ skipping 79 matching lines @@
 
 
 int IOBuffer::GetRemainingLength() {
   ASSERT(operation_ == kRead);
   return data_length_ - index_;
 }
 
 
 Handle::Handle(HANDLE handle)
     : handle_(reinterpret_cast<HANDLE>(handle)),
-      flags_(0),
       port_(0),
+      mask_(0),
       completion_port_(INVALID_HANDLE_VALUE),
       event_handler_(NULL),
       data_ready_(NULL),
       pending_read_(NULL),
       pending_write_(NULL),
-      last_error_(NOERROR) {
+      last_error_(NOERROR),
+      flags_(0) {
   InitializeCriticalSection(&cs_);
 }
 
 
 Handle::Handle(HANDLE handle, Dart_Port port)
     : handle_(reinterpret_cast<HANDLE>(handle)),
-      flags_(0),
       port_(port),
+      mask_(0),
       completion_port_(INVALID_HANDLE_VALUE),
       event_handler_(NULL),
       data_ready_(NULL),
       pending_read_(NULL),
       pending_write_(NULL),
-      last_error_(NOERROR) {
+      last_error_(NOERROR),
+      flags_(0) {
   InitializeCriticalSection(&cs_);
 }
 
 
 Handle::~Handle() {
   DeleteCriticalSection(&cs_);
 }
 
 
 void Handle::Lock() {
@@ skipping 804 matching lines @@
   // Initialize Winsock32
   if (!Socket::Initialize()) {
     FATAL("Failed to initialized Windows sockets");
   }
 }
 
 
 void EventHandlerImplementation::Shutdown() {
   SendData(kShutdownId, 0, 0);
 }