Fix Windows build

runtime/bin/eventhandler_win.cc

Index: runtime/bin/eventhandler_win.cc
diff --git a/runtime/bin/eventhandler_win.cc b/runtime/bin/eventhandler_win.cc
index 7c04d00052b1f01214c87b6efbb4cd134021a377..25e284c7d4e2ddaa7826a540f193ebd64f337855 100644
--- a/runtime/bin/eventhandler_win.cc
+++ b/runtime/bin/eventhandler_win.cc
@@ -644,7 +644,7 @@ void EventHandlerImplementation::HandleInterrupt(InterruptMessage* msg) {
       if ((msg->data & (1 << kInEvent)) != 0) {
         if (handle->Available() > 0) {
           int event_mask = (1 << kInEvent);
-          DartUtils::PostInt32(port, event_mask);
+          DartUtils::PostInt32(handle->port(), event_mask);
         } else if (!handle->HasPendingRead() &&
                    !handle->IsClosedRead()) {
           handle->IssueRead();
@@ -656,7 +656,7 @@ void EventHandlerImplementation::HandleInterrupt(InterruptMessage* msg) {
       if ((msg->data & (1 << kOutEvent)) != 0) {
         if (!handle->HasPendingWrite()) {
           int event_mask = (1 << kOutEvent);
-          DartUtils::PostInt32(port, event_mask);
+          DartUtils::PostInt32(handle->port(), event_mask);
         }
       }
 
@@ -692,7 +692,7 @@ void EventHandlerImplementation::HandleAccept(ListenSocket* listen_socket,
   if (!listen_socket->IsClosing()) {
     int event_mask = 1 << kInEvent;
     if ((listen_socket->mask() & event_mask) != 0) {
-      DartUtils::PostInt32(port, event_mask);
+      DartUtils::PostInt32(listen_socket->port(), event_mask);
     }
   }
 
@@ -705,7 +705,7 @@ void EventHandlerImplementation::HandleAccept(ListenSocket* listen_socket,
 void EventHandlerImplementation::HandleClosed(Handle* handle) {
   if (!handle->IsClosing()) {
     int event_mask = 1 << kCloseEvent;
-    DartUtils::PostInt32(port, event_mask);
+    DartUtils::PostInt32(handle->port(), event_mask);
   }
 }
 
@@ -719,7 +719,7 @@ void EventHandlerImplementation::HandleRead(Handle* handle,
     if (!handle->IsClosing()) {
       int event_mask = 1 << kInEvent;
       if ((handle->mask() & event_mask) != 0) {
-        DartUtils::PostInt32(port, event_mask);
+        DartUtils::PostInt32(handle->port(), event_mask);
       }
     }
   } else {
@@ -743,7 +743,7 @@ void EventHandlerImplementation::HandleWrite(Handle* handle,
     if (!handle->IsClosing()) {
       int event_mask = 1 << kOutEvent;
       if ((handle->mask() & event_mask) != 0) {
-        DartUtils::PostInt32(port, event_mask);
+        DartUtils::PostInt32(handle->port(), event_mask);
       }
     }
   } else {