Avoid needless int64_t to intptr_t conversion in eventhandler.

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 828 matching lines @@
   if (timeout_ == kInfinityTimeout) {
     return kInfinityTimeout;
   }
   intptr_t millis = timeout_ - GetCurrentTimeMilliseconds();
   return (millis < 0) ? 0 : millis;
 }
 
 
 void EventHandlerImplementation::SendData(intptr_t id,
                                           Dart_Port dart_port,
-                                          intptr_t data) {
+                                          int64_t data) {
   InterruptMessage* msg = new InterruptMessage;
   msg->id = id;
   msg->dart_port = dart_port;
   msg->data = data;
   BOOL ok = PostQueuedCompletionStatus(
       completion_port_, 0, NULL, reinterpret_cast<OVERLAPPED*>(msg));
   if (!ok) {
     FATAL("PostQueuedCompletionStatus failed");
   }
 }
@@ skipping 61 matching lines @@
   // Initialize Winsock32
   if (!Socket::Initialize()) {
     FATAL("Failed to initialized Windows sockets");
   }
 }
 
 
 void EventHandlerImplementation::Shutdown() {
   SendData(kShutdownId, 0, 0);
 }