Enable warning 4389 as an error on windows builds. This will make...

net/base/network_change_notifier_win.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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 "net/base/network_change_notifier_win.h"
 
 #include <iphlpapi.h>
 #include <windows.h>
 #include <winsock2.h>
 
 #include "base/basictypes.h"
@@ skipping 32 matching lines @@
 NetworkChangeNotifierWin::Impl::~Impl() {
   CancelIPChangeNotify(&addr_overlapped_);
   addr_watcher_.StopWatching();
   WSACloseEvent(addr_overlapped_.hEvent);
   memset(&addr_overlapped_, 0, sizeof(addr_overlapped_));
 }
 
 void NetworkChangeNotifierWin::Impl::WatchForAddressChange() {
   HANDLE handle = NULL;
   DWORD ret = NotifyAddrChange(&handle, &addr_overlapped_);
-  CHECK_EQ(ERROR_IO_PENDING, ret);
+  CHECK(ret == ERROR_IO_PENDING);
   addr_watcher_.StartWatching(addr_overlapped_.hEvent, this);
 }
 
 void NetworkChangeNotifierWin::Impl::OnObjectSignaled(HANDLE object) {
   notifier_->OnIPAddressChanged();
 
   // Start watching for further address changes.
   WatchForAddressChange();
 }
 
 NetworkChangeNotifierWin::NetworkChangeNotifierWin()
     : impl_(new Impl(ALLOW_THIS_IN_INITIALIZER_LIST(this))) {
   impl_->WatchForAddressChange();
 }
 
 NetworkChangeNotifierWin::~NetworkChangeNotifierWin() {}
 
 }  // namespace net