Disconnect native messaging port on read pipe EOF.

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

Index: chrome/test/data/extensions/api_test/native_messaging/test.js
diff --git a/chrome/test/data/extensions/api_test/native_messaging/test.js b/chrome/test/data/extensions/api_test/native_messaging/test.js
index e1a7bfc6bf3fc82cbc80f29f9ca3652b19a3795f..f5cc66c9b7f85ed3e2d5b785d4fa90a317c33069 100644
--- a/chrome/test/data/extensions/api_test/native_messaging/test.js
+++ b/chrome/test/data/extensions/api_test/native_messaging/test.js
@@ -76,10 +76,7 @@ chrome.test.getConfig(function(config) {
         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.