Disconnect native messaging port on read pipe EOF.

chrome/test/data/extensions/api_test/native_messaging/test.js

 // Copyright (c) 2012 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.
 
 var appName = 'com.google.chrome.test.echo';
 
 chrome.test.getConfig(function(config) {
     chrome.test.runTests([
       function invalidHostName() {
         var message = {"text": "Hello!"};
@@ skipping 58 matching lines @@
         });
       },
 
       // Verify that the case when host stops itself is handled properly.
       function stopHost() {
         port = chrome.extension.connectNative(appName);
 
         port.onMessage.addListener(function(message) {
           port.onDisconnect.addListener(chrome.test.callback(
               function() {},
-              "Error when communicating with the native messaging host."));
-          // Sending second message here should fail because the host has
-          // already stopped.
-          port.postMessage({ "secondMessage" : "foo" });
+              "Native host has exited."));
         });
 
         // Send first message that should stop the host.
         port.postMessage({ "stopHostTest": true });
       }
     ]);
 });